Sfc.exe
Sometimes, installing third party software in Windows XP can overwrite important system files and lead to instability. This is where an under-used part of the Windows XP operating system comes into its own.
System File Checker (sfc.exe)
Running this utility couldn't be easier. All you need to do is;
1) Put your XP CD into the drive
2) Click on the Start button, then "Run"
3) In the "Run" box just type sfc /scannow - and then press enter
**Note that the run command should be typed exactly as it appears above with a space between sfc and /
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