Please note that the following instructions are valid for Windows Vista only.

• Click Start, type cmd in the Start Search box, right-click cmd in the Programs list, and then click Run as administrator.
• Click Continue to authorize opening a command prompt with administrative privileges
• Run the following command in the command prompt:
  
  Code:

  sfc /scannow

• The command prompt will list text stating "Beginning system scan. This process will take some time."
• Wait for the scan to complete (this can take several minutes). This command will scan all protected system files and attempt to replace incorrect versions with correct Microsoft versions
• When the scan completes, the SFC utility will indicate whether or not it has found any problems and whether or not it was able to fix them.
• If any errors are reported that SFC was unable to fix, please refer to the following Microsoft support article:
  How to analyze the log file entries that the Microsoft Windows Resource Checker (SFC.exe) program generates in Windows Vista