How to use System File Checker in Windows


In Windows 7 & Vista, the System File Checker is integrated with Windows Resource Protection, which protects registry keys and folders as well as critical system files. If any changes are detected to a protected system file, the modified file is restored from a cached copy located in the Windows folder itself.

Open cmd ( admin rights ) and run

 sfc /scannow

The sfc utility will run for a while and if any corruptions are found, replace them on re-boot.

sfc switches:

Scan once at next boot:   sfc /scanonce
Scan at every boot:  sfc /scanboot
Purge File Cache:  sfc /purgecache
Return to Default Setting:  sfc /revert

SOURCE:
http://www.thewindowsclub.com

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