Windows XP System File Checker

Windows XP System File Checkertried typing "sfc.exe" in the Run window of XP and all I got was a one second DOS window flash. So, I figured that SFC wasn't necessary. Then, to my surprise, I found out how to use SFC in XP. I'm gonna pass this info along to you today.When you run System File Checker it looks to see if any protected files have been overwritten. If so, it grabs the correct version