* This Command works really Great. * Windows File Protection command line utility System File Checker (sfc.exe) This is a great tool for troubleshooting Windows XP problems. How to use scannow sfc The main reason for using this utility is when you suspect there may be a problem with a Windows XP system file.
Perhaps you get a dialog box appear informing you of a problem with a .dll file, or your program will just not load! It is therefore worth checking to see if there are any corrupt system files using scannow sfc.
To do this simply go to the Run box on the Start Menu and type in:
sfc /scannow
This command will immediately initiate the Windows File Protection service to scan all protected files and verify their integrity, replacing any files with which it finds a problem.
If u want to know more Then Visit Here scannow sfc - LEARN how to use SFC.EXE (system file checker) in this article! 
Re: Easy way to Repair Windows XP system file 
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