How to Convert LVF to AVI Video to View Your CCTV Camera Footage

I need to convert my CCTV security camera footage from LVF to AVI in order to actually see the video. My VLC free media player usually plays everything  but this time I could not find any players that would work with a LVF file.

So what I needed was a program that converted the camera footage into AVI format. Any Video Converter did not do the trick in this case. Finally I relised I had been given a small disc with the CCTV camera system. The program I needed was on there.

The program is called LVF2AVI and this video shows you how to use it. I also stated (in the video) that you should protect your computer before downloading this exe file as these sites are completely unknown to me.

Convert LVF to AVI Video

How to use Winrar as Folder Lock ?

Getting a good folder lock for free is really a tough job. I myself had searched a lot for these folder lock software but i didn’t find any good one that is really worth using. Then i made up my mind to check out on torrent and i got premium folder lock software there. Though i got paid software for free but i got too many viruses with them so i removed everything from my system to clean it. At last i ended up with a very good method to use Winrar as a folder lock. So i am discussing that method in this article. 

Steps to use Winrar as Folder Lock

1. Download Winrar — Click Here To Download.

2. Install it.

3. Now right click on the folder that you want to lock and choose “Add to archive“.

4. Here you will get the following window.

5. Switch to the “Advanced” tab and check both “Save file security” & “Save file streams“options under NTFS options.

6. Then click on “Set password” button.

7. OK now you will get the following window. Check “Encrypt file names” for better security & enter the password and then click “OK” and again “OK” button.

Finally your folder is locked without paying anything and saving disk space since Winrar compress files and folders.

Which operating system is better – Linux or Windows?

Linux operating system has been developed in the year 1991 by Linus Torvalds. This operating system is Unix friendly and is an alternative of the Minix operating system. On the other hand, Microsoft Windows was launched in the year 1985.This operating system can be used easily and has a graphical edge for Microsoft Disk Operating System (MS-DOS). While commercial Microsoft Windows rules both home as well as business, Linux-based operating systems are achieving popularity and can be used in both the sectors too.

The center of the Linux operating system is called the kernel. It is an open source and is allocated under

the General Public License version. The software developers have the right to use the source code and can change it in the way they want. Alternatively, Windows is reparation software that is made and trademarked by the Microsoft Corporation. You need to know that Windows operating system can only be developed and modified by Microsoft.

The Linux distributions are popularly known as distros. They are packages that consist of the Linux kernel, software packages and a client interface like the GNOME or KDE desktop. The expert users can miss out on a distribution completely and install the kernel and supporting software like the applications and desktop interface one by one. Microsoft Windows is available in various editions for different user settings. For example, Windows 7 has different versions for the ones who are using it at home and the ones who are using it for business purpose.

Linux is generic software that can be installed on a variety of hardware configurations. This operating system has open nature and enables the users to change the kernel for meeting the hardware requirements. Some Linux distributions are available as Live Distros in which users can try out the Linux sharing with the help of a USB drive or a CD. You’ll not have to install it on a live hard drive. Conversely, windows can be installed on the different computer systems such as desktops, laptops and tablets. The mobile appliances will require a separate version of Windows known as Windows Phone which is only installed by the producers of the gadget.

The choice between Linux and Windows operating system is not so very clear. Some business like web hosts get benefit from both the operating systems. The web applications will generally require either an Asp.net server for Windows or a PHP server for Linux. Linux operating system is mainly used in the hosting sector. So, it’s common for the businesses to use both of them. In contrast, a business with internal programmers may choose Linux, while another business may opt for Windows.

While discussing about Linux licensing models, you need to know that they depend completely on the supply. Most Linux distributions can be downloaded free of cost and are used for both personal as well as commercial use. Companies like Red Hat offer a free to use and revised version of Linux for the businesses called Red Hat Enterprise Linux (RHEL) and Fedora which is a distribution intended at the end users. Both of them are free however, the companies that are using RHEL can choose to pay a yearly subscription fee. This will enable the companies to get improved product support.

Microsoft has devised various licensing models for the Windows operating system. It has set different price structures for the home users, small businesses and enterprise users. So, if you are planning to buy one, see that you make the right choice by taking into consideration your exact need. This way, your money will not go in waste in anyway.

Latest trick for Speed up your internet connection using SQUID proxy on WINDOWS

So what is squid or a caching proxy in general? The squid website says

Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. Itreduces bandwidth and improves response times by caching and reusing frequently-requested web pages.
So why would you want to use it? From my experience, if you are in any ofthe following situations:
* You want your browsing to be snappy in general (helps on cable/ADSL too!)
* You are shaped and want better performance when browsing your frequently-visited sites
* You are about to get shaped and want to reduce your quota consumption
* You are on a flaky, high-latency or slow connection (e.g. laptop Wi-Fi, wireless broadband, dial-up)
While it is true that your web-browser most definitely has an internal cache, you'll likely get a noticeable improvement in perceived latency due to squid's DNS caching. On top of that, I find squid picks up 25% of traffic that my install of Firefox doesn't cache, misses or expires.
:: Downloading squid for Windows::
https://www.box.com/s/mwo90rhfbo3xm15qejis
{2MB}

Now its time to preparing squid...
First extract squid on c:/ so that so that all of the files appear under c:\squid (and not c:\squid\squid)
.
otherwise it will not work...anymore...
then open the cmd from the start menu..and if u r using win 7 then..u have to run the cmd in administrator..
after that navigate to c:\squid\sbin
in cmd ..that means u hav to wright as following in cmd..
cd /d c:\squid\sbin
then Run: squid -z
its shows like this...

then configure the firefox...or ur default browser to 127.0.0.1:3128

Now try to view a website. It should fail.
That's good, it just means there's nothing already running on squid's port, which is what we want. We can now get the proxy up and running in the next section
now its time to run the proxy....
With the prompt still open, run: squid -X

u hav now the fastest browsing with dns cache...
if u will wish to run the squid on windows start ...
Type again with the prompt still open, run: squid -i -n squid -O -D
=> 
HERE ARE SOME PROOF::

How to to increase Browsing speed

Having Problem with Your Browser to Load page and it takes more time to load your page?? so here is the solution to your problem. Firefox is already pretty damn fast but did you know that you can tweak it and improve the speed even more?That's the best of this program being open source.
 
Here's what you need to do:

In the URL bar, type “about:config” and press enter. This will bring up the configuration “menu” where you can change the parameters of Firefox.

Note that these are what I’ve found to REALLY speed up my Firefox significantly - and these settings seem to be common among everybody else as well. But these settings are optimized for broadband connections .

Double Click on the following settings and put in the numbers below - for the true / false booleans - they’ll change when you double click.

Code:

browser.tabs.showSingleWindowModePrefs – true
network.http.max-connections – 48
network.http.max-connections-per-server – 16
network.http.max-persistent-connections-per-proxy – 8
network.http.max-persistent-connections-per-server – 4
network.http.pipelining – true
network.http.pipelining.maxrequests – 100
network.http.proxy.pipelining – true
network.http.request.timeout – 300

 Right-click somewhere on that screen and add a NEW -> Integer. Name it “nglayout.initialpaint.delay” and set its value to “0”. This value is the amount of time the browser waits before it acts on information it receives. Since you’re broadband - it shouldn’t have to wait.

Now you should notice you’re loading pages MUCH faster now! If you like the post do share it with your friends and comment.

Top 5 Key Computer Hardware Components

If you want to understand computers, you have to understand computer hardware components. A machine is the sum of its parts, and five parts in particular make computers what they are today.

Component #1—A Surprise

I was going to start this article by talking about the computer processing unit—after all, what’s a computer without a computer processor? But then I thought to myself, what’s a computer without electricity?

The power supply, often abbreviated PS, is an often neglected but entirely essential part of every working computer. If the computer processing unit is the mind of a computer, the power supply is its heart—hard working and undervalued until it stops working.

Obviously power supplies provide power to the individual parts of a computer, but that’s oversimplifying their job. The different parts of your computer expect different voltages and wattages. It’s up to your power supply to convert the electricity coming from your wall into all of these different combinations which your computer requires.

Making this job even more difficult is the general rottenness of home power delivery. In many places, power comes in relatively unevenly—you’ve probably noticed your lights flickering during a thunderstorm, but tiny shorter power fluctuations like that are happening all of the time even on the nicest day.

Electronics, especially the sensitive ones in a computer, don’t like those fluctuations. A tiny, barely-measurable fluctuation at the wrong time can cause your computer processor to drop a decimal point which, in turn, can crash your computer. (Computers hate bad math.)

So a quality power supply includes not just an inverter to alter the voltage type but capacitors and regulators to filter out drops and peaks in power. Yet for all of its hard work, your power supply hardly gets any recognition at all.

Component #2—The Mind Without Memory

The number one computer hardware component people want to know about is the computer processing unit (CPU). How fast is it? How many cores does it have? Is it 32 or 64 bits?

For all of the attention paid to it, most of the time your CPU does absolutely nothing. It’s like an efficient secretary who does all of the paperwork the moment it hits her desk—and then spends the rest of the day painting her nails.

However, it feels like your computer is always working, and that’s because your computer can think much, much faster than you can. On a typical modern computer, when you move your mouse just slightly, your computer takes a few microseconds—that’s a a few millionths of a second—to redrew the mouse cursor on your desktop. It takes your monitor up to 5 milliseconds just to draw that image (5 milliseconds is 5,000 microseconds) and then it takes the typical person 10–20 more milliseconds to notice the change. So your computer processing unit does about 5 microseconds of work and you don’t finish noticing it until about 25,000 microseconds later. No wonder science fiction writers worry so much about computers taking over the world.

Lucky for us humans, fast computers are still dumb computers. Your computer processing unit can only do a few basic operations and each operation can only use a few variables (which are stored in a special part of the CPU called a register). If the computer wasn’t designed to perform a particular operation, it either can’t do it or it needs a program on your computer to convert the problem into a set of operations the computer processor can perform—for example, a program on your computer converts every letter you see into numbers so the computer can work on them.

Component #3—64 Millisecond Amnesiac

Some people have really bad memories, but imagine someone who forgets everything in 64 milliseconds unless you remind him. That’s exactly how your computer memory works. (The main computer memory on your computer is called Random Access Memory [RAM]).

The memory chips on your computer are specially designed to hold an electrical charge for a very short amount of time, typically 64 milliseconds. After that time expires, the charge quickly fades away unless your computer refreshes it.

It seems to me that refreshing possibly gigabytes worth of memory every 64 milliseconds would consume too much time, but in modern RAM, the refresh cycle only slows your computer down by about one percent.

The only problem computer scientists have found with typical computer memory is that refreshing the memory every 64 milliseconds (15 times per second) uses up extra power. These days as computer manufactures make smaller and slimmer devices, there’s a push to reduce power consumption, so researchers are working on advanced persistent computer memory which doesn’t need to be refreshed periodically or which just doesn’t need to be refreshed as often. IBM estimates that replacing typical computer memory with persistent computer memory can triple the battery life of a typical laptop.

Component #4—More RPM Than A Race Car

One of the marvels of modern engineering sits inside most of our computers—the hard drive. Here is a tiny little box which stores gigabytes or even terabytes of data that we can retrieve in milliseconds.

To manage this incredible feat, the hard drive is built to amazing tolerances. Dozens or hundreds of tiny disks thinner than a sheet of paper rotate over some of the most precise ball bearings ever made. The disks rotate 5,000 to 20,000 times per minute (RPM), meaning the ball bearings rotate dozens of times faster than that.

The earliest hard drives were as big as refrigerators and stored only a few megabytes. Today hard drives and their successors, solid state drives, continue to push the barrier of what’s even possible.

Component #5—How Computers Conquered The World

The last component on our list today has undergone more changes than all the others combined. It’s the expansion port. On the original PCs—before Macs existed—many accessories had to be hardwired into a computer. (And heaven help him that soldered the positive and negative connections backwards!)

Later came specific slots in a computer that could accept a wide variety of accessories. The most popular early standard was ISA cards, and you could still find new computers with vestigial ISA ports just a few years ago. Then came the second most popular standard of all time—PCI ports. These reigned supreme throughout the 1990s. If you wanted at add an accessory to your computer, you got it on a PCI card.

PCI was slowly supplanted in the late 1990s and early 2000s by a standard we’re all familiar with—USB. USB did us a great service by moving the accessories outside a computer where there’s more space and more flexibility. USB also lets us add or remove devices without turning off the computer, which is an incredible convenience.

USB has been through several standards and it’s seen some competing protocols for specific kinds of devices (mostly disk drives and computer monitor cables), but the newest USB 3.0 protocol seems like it will take its place alongside early USB protocols in the history of popular computer hardware components.

How To Clean Up Your Ram Using Notepad (Super Speed)

Many friends of me ask where can I download a software which can keep my RAM free?
And I found these software are nothing but using some lines of code which can be implemented by using notepad or any editor tool. So if any one does not have any software, you can use it by doing the following things which I am going to mention.
=> Steps to Clean Your RAM Using Notepad:
Step 1: Open Notepad
Step 2: Type FreeMem=Space(10240000000)
Step 3: Save it as “CLEANER.VBS” in any location you like.
Step 4: You can edit the code and write 512 instead of 1024if you own a 512mb RAM or change to anything you like.
Step 5: Run it !
After this final step your RAM will be free.
Hope you enjoyed it.

How to protect your pendrive from autorun.inf virus

Pendrive ruined by autorun.inf?

Have this ever happened to you. Have you been ever infected by autorun.inf. If your answer is no then you are lucky. Its the most common virus out there. Infecting every device that you connect your external drive of a pendrive. When you plug in a pendrive to an infected system the autorun.inf automatically is written to your pendrive. From there it is transferred to every device you plug in your device. You wouldn’t necessarily know if the system to which you are going to plugin your pendrive is infected or not. So how to fool proof your pendrive from this nasty virus. Remember this is not a virus removal tool or anything like that. This just shows you the technique to resist getting infected.

Just follow this steps and you will never get autorun.inf virus again.

Have you bought a new pendrive and want to make it safe against autorun,.inf. Here are the steps. The same technique works on hard drives and other external devices like memory cards.

• Create a new folder in pendrive.
• Rename the newly created folder as autorun.inf.
• Right click on the folder and click on properties.
• Mark the folder as read only and save the changes.

That is all you need to protect your device from the nasty virus. Technique used here is simple. Windows wont allow two files with the same name. So when the infected system tries to write autorun.inf onto your device it wont work. As the file has been made read only it cannot be altered by the infected system either. So you are completely protected by the autorun.inf virus

How to Merge Hard Drive Partition in Windows 8

Windows 8, the supreme OS by Windows is pretty awesome. The fastest OS by Microsoft yet has many great features. It’s the fastest selling OS in the history of the computing world. Win 8 has many features and one of them is merging Hard drive parts directly via control panel tool. There is no need of downloading 3rd party applications to do your job.

Merging or combining of Hard drive partitions means that joining two or more single disk parts into one to get one single part. This will result in faster data access and indexing and as well as better performance. Sometimes accidental partition can be repaired too via this method. Combining two or more partition has been made easy by the Computer Management Tool in Windows 8. Remember that these steps can also be followed for Windows 7 and Vista.

Windows 8 : Merging or Combining Hard drive partitions

Before, heading out with the step by step process, let me tell you what happens here exactly in this procedure. Suppose we are going to merge ‘D’ partition and ‘E’ partition, in which none of them are the primary boot partition. What happens here is that these drives combine to form a larger sized ‘D’ drive, or in general terms D:\ drive. Now the steps.

Step 1 – First of all hit the Win + X key combination. You will see a menu pop onto the left lower corner of your Win 8 desktop screen. You can also access Computer Management tool via the control panel. Open Control Panel and navigate to System and Security > Administrative Tools > Computer management.

Step 2 – Once you are inside the tool, you will see a Storage drop down menu on the left pane, below which there are is Disk Management. Click on it and you will a loading process taking place.

Step 3 – Once the loading is done, you will see all the disks and their parts on the central pane. Select the drive you want to combine with the other drive ( Like E: will be combined and added to D: drive).

Step 4 – Now, in this step, you have to back up any important data and delete the partition of the drive you want to combine. Delete it by right clicking on the selected partition and then selecting Delete Volume.

Step 5 – Once this has happened. Now select the drive where you want the free partition to be attached and combined.Right-Click on that partition and select Extend Volume and next. After doing that, it should look like the snapshot below.

Step 6 - Now you will enter the enter Extend Volume wizard for the partition to be combined. Keep on clicking next and your work is done here. Voila, your work is done and the two partitions have been merged or combined.

This is all you need. You have learned to manage and extend or merge hard drive partitions and now you will able access and manage data like ever before. If you face any problems or have any queries let us know. I will be glad to connect to you.

How to Install Spotify on Ubuntu

Spotify on Ubuntu, yes it is now available for Ubuntu. People at Spotify has made it possible for Spotify users to access it on Ubuntu. Ubuntu is the world’s largest Linux-based OS with a user base of more than a million. Developers at Spotify has therefore released an application dedicated to Ubuntu users.

Spotify for Ubuntu is still under preview but it works rock solid. I have been using Spotify from the past month on the Linux distribution version 12.10 and 13.04, and till now it has never crashed or has given me any problems. It is fast and reliable as it is on other devices. It is even better than its Windows counterpart.

What is Spotify?

Spotify is a great application with more than million users using it daily. It allows you stream unlimited amount of music for free. Though the free version uses ads to earn revenue to keep the project up and running but still you won’t mind it. Millions of music tracks have so much value than 15 second ads on this application.

There are also two paid option. The first one is for $4.99, it is ad free and you can stream all the music you want without any disturbance. The second on the other hand allows you to download any music available on it for off-line listening. Spotify Free allows you to listen to any amount of music you want to, but with ads in between.

It is a great application for music lovers and it contains all the song one can think of. I have been using Spotify for the past one year with a premium account and it works great for me. Gone are the days, when my hard disk had huge amount of music. All the songs that I have right now are on Spotify, a cloud type storage.

How to install Spotify on Ubuntu

To install Spotify on Ubuntu, you have to follow a few simple steps. It takes minutes for completion and after that you can start using it and fall in love with it. Follow these steps to continue your installation of Spotify for Ubuntu.

Remember that Spotify for Ubuntu is still a preview build therefore it can crash a few times. I experience, a very low amount of crash. Still, it works great if you don’t mind the buggy crashes of the Debian file that occurs once in a blue moon.

To install Spotify follow these steps:

1.Add this line to your list of repositories editing your /etc/apt/sources.list
   "deb http://repository.spotify.com stable non-free"

Now open the terminal by pressing CTRL + ALT + T.

2.If you want to verify the downloaded packages,you will need to add our public key. 
Open the terminal and copy and paste the lines below.
  sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 94558F59

3.Run apt-get update, on the terminal by entering these lines below. 
  sudo apt-get update

4.Install spotify! by adding these lines in the terminal.
sudo apt-get install spotify-client

Home & Office Computer Monitoring Software

photo credit: Highways Agency

There are a range of reasons you might need to monitor your computers, either at home or the office. First and foremost it’s great practice for security and back-up reasons. If you ever have a break in monitoring software can help you see what’s happened on the computer during the break in.

If a machine is stolen the software may even help you recover it. If you have some sort of power or hardware failure, Computer monitoring software will have all your work and activities backed up to date.

Of course the main reason people install computer monitoring software is to check up on users digital activities while you’re away or otherwise engaged. At home, you may have unruly teenage children who insist on spending their time playing computer games rather than doing homework.

Especially when they’re hiding in their rooms. At work, you may have a similar problem with employees, or colleagues using your computer when you’re not around. If you’re worried that your staff are spending more time on YouTube and internet shopping than they are getting on with work than computer monitoring software is for you.

Depending on what you need the software for will determine exactly which sort you’ll need, as there are a few different types of office monitoring software.

Free versions of software will usually just monitor keystrokes, but not websites or applications. But full versions will give you a more complete picture of what’s happening while you’re away.

Feature Of  Computer Monitoring Software :

• All keystrokes typed, and the website/application they were typed in.
• All websites visited.
• All applications used.
• All files and documents opened, moved, saved or deleted.
• Anything printed.
• Anything copied or pasted to or from the clipboard.

These features are standard among most commercial monitoring applications, although obviously they will vary from developer to developer. Some will also include extra features like microphone or web cam monitoring. Remote report emailing is also a feature present in most applications.

This means you’ll be able to set up the software to email you the reports at a different location, so that you won’t have to log back into the target machine and risk getting caught.

Home monitoring software like this is easy to download and install and will run (if required) in complete stealth on the target computer. The program will be hidden from users and will not be visible in places like the task manager, start menu or add/remove programs list.

The only way to open the software will be through a secret key combination and user defined password, which will be set up when installing. If you’re looking for computer monitoring software with all of the features mentioned above, take a look at the free trial of Gecko Monitoring Software

All of the above will be suitable for monitoring a single home or office computer. But if you’re looking to monitor an entire office, you’ll probably require something a bit more substantial. Office or employee monitoring software will do all of the above but will be designed to monitor an entire office network, while keeping check on the network from a single computer.

From the monitoring computer, you’ll be able to have a look at what’s going on on any of the other office computers at any time. Some applications even let you see a video feed of the computers monitor as it’s happening, meaning you’ll be able to see exactly what your employees are doing right at that moment.

You’ll also be able to control the computers from your own, so that if your employees need help with anything you can do it from your own computer.

How To Change Default Web Browser in Windows 8

Windows 8 provides us a complete different type of environment then windows 7 or any other version of operating system. Applications run on the full screen mode. Looks are totally awesome in windows 8 metro style UI. Windows 8 do have two modes of running some Apps, Desktop mode or Metro UI Mode. E.g. if you will see internet explorer in windows 8 then you can easily analyse what I wanted to say. If you are running internet explorer from the start menu in then you will get a metro UI version of internet explorer but if you run it from the desktop then you will get traditional desktop version of windows internet explorer.

You will get a metro UI version if and only if you have set internet explorer to your default web browser.So while installing any other web-browser if you have set other browser to your default web browser then you will not be getting internet explorer 10 in metro UI style. If you want to change your default web-browser then you can follow the following steps, you can also change other default program setting using these steps.

To change the default program setting you need to follow the following steps:

1. Just Go to Start And Type “Default”.

2. Click On “Default Programs” and you will see Option “Set You Default Program” click on it.

3. Choose “Internet Explorer” from left side list and choose “Set This Program as a Default”.

You are done. You have change the default program in your windows 8. You can also change other programs settings like I said before.

Best Top 10 Data Recovery Software Name

You know where to discover the most significant records on your PC -the archives, the pictures, the music -and they're dependably ready when you require them. So its simple to collect that is the way it will dependably be.
The actuality could be extremely diverse, however. Probably you're not giving careful consideration for a minute and erase something incidentally, maybe there's a programming bug, or something happens to degenerate your hard drive: whatever it is, the final consequence is that you've lost records, envelopes, possibly even a whole parcel of important information.
Don't alarm, however -there's an exceptional risk that your indexes are still whole, any place on the disc. Furthermore provided that you enactment speedily then you may have the capacity to recoup everything. All you'll need is solid unlimited undelete programming to run a sweep, and we've discovered ten unhindered apparatuses which can serve some useful purpose.
Below is the List:
1. Recuva Free
2. Undelete 360
3. MiniTool Partition Recovery
4. Wise Data Recovery
5. PhotoRec
6. FreeUndelete
7. Paragon Rescue Kit Free
8. Glary Undelete
9. Pandora Recovery
10. PC Inspector File Recovery

What is the System File Checker (SFC) for Windows?

When you have a computer that won’t start or maybe even a black screen on your computer, using the system file checker can be a handy tool indeed. I have been saved many times by this Windows system tool.

What is the System File Checker (SFC)?

System File Checker gives an administrator the ability to scan all protected files to verify their versions. If System File Checker discovers that a protected file has been overwritten, it retrieves the correct version of the file from the cache folder (%Systemroot%\System32\Dllcache) or the Windows installation source files, and then replaces the incorrect file. System File Checker also checks and repopulates the cache folder.

You must be logged on as an administrator or as a member of the Administrators group to run System File Checker. If the cache folder becomes damaged or unusable, you can use the sfc /scannow, the sfc /scanonce, or the sfc /scanboot commands to repair its contents.

Source: Microsoft support

What commands Can We Use With SFC?

You can see the command switches yourself by opening a CMD window and typing in Sfc /? See the screenshot below for more details. these switches allow you to perform a different action.

Sfc [/Scannow] [/Scanonce] [/Scanboot] [/Revert] [/Purgecache] [/Cachesize=x]

• /Scannow: Scans all protected system files immediately and replaces incorrect versions with correct Microsoft versions. This command may require access to the Windows installation source files.
• /Scanonce: Scans all protected system files one time when you restart your computer. This command may require access to the Windows installation source files when you restart the computer. The SfcScan DWORD value is set to 2 in the following registry key when you run this command:
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
• /Scanboot: Scans all protected system files every time you start your computer. This command may require access to the Windows installation source files every time you start your computer. The SfcScan DWORD value is set to 1 in the following registry key when you run this command:
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
• /Revert: Returns scan to the default setting (do not scan protected files when you start the computer).The default cache size is not reset when you run this command. This command is equivalent to the /Enable switch in Windows 2000.
• /Purgecache: Purges the file cache and scans all protected system files immediately. This command may require access to the Windows installation source files.
• /Cachesize=x: Sets the file cache size to x megabytes (MB). The default size of the cache is 50 MB. This command requires you to restart the computer, and then run the /purgecache command to adjust the size of the on-disk cache. This command sets the SfcQuota DWORD value to x in the following registry key:
  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

The most common SFC command is the SFC / scannow which will scan and verify the versions of all protected system files after you restart your computer.

How to Run the System File Checker SFC /SCANNOW Command For Windows XP

If you are using Windows XP, to run the system file checker you will need the Windows installation cd. Otherwise you need to locate a directory on your computer named the i386. This directory is sometimes hidden or just does not exist.

1. Insert your operating system cd in your drive.
2. Go to the Start menu and choose run from the menu.
3. When the Run box appears type in sfc /scannow.

How to Run the System File Checker SFC /SCANNOW Command For Windows Vista and Windows Seven +

If you run the system file checker (SFC) in Windows Vista or Windows Seven you do not need the operation disc. Simply run cmd as an administrator and type in the sfc /scannow command (System File Checker). Then it will scan the integrity of all protected Windows system files and replaces incorrect corrupted, changed/modified, or damaged versions with the correct versions if possible.

1. If the %systemroot%\system32\dllcache folder becomes corrupt or unusable, use sfc /scannow, sfc /scanonce, or sfc /scanboot to repair the contents of the Dllcache directory. See the above switches for more information.
2. You must be logged in as an Administrator to run the sfc command.
3. If sfc discovers that a protected file has been overwritten, it retrieves the correct version of the file from the %systemroot%\system32\dllcache folder, and then replaces the incorrect file.
4.  If you have modified your system files as in theming explorer/system files, using the sfc /scannow command will revert the system files such as explorer.exe back to it’s default state. Cool but not cool when you have spent a lot of time on customizing your computer.

How to See the Results of the SFC / SCANNOW Command

After the SFC / scannow command has finished it will create a log file. This is a simple text file with the results of the scan.

1. Go to the start menu and choose computer. 

2. In the search box type in cbs.log.

You can also paste this text into the dos command window to see the results on your desktop.

findstr /c:”[SR]” %windir%\logs\cbs\cbs.log >> “%userprofile%\desktop\sfcdetails.txt”

To paste this string you must first copy it, then right click in the cmd window and select paste from the menu.