The SFC utility allows administrators to perform a scan of all protected resources to verify that they are the correct version. If SFC should find any incorrect versions in any of these protected resources, SFC will replace them with the correct versions.

Here's how to use the System File Checker:

1. Click the Windows button>> All Programs>> Accessories.
2. Right click the Command Prompt option and then select "Run as administrator" from the resulting menu.
3. With the Command Prompt window showing, type in: sfc /scannow [Enter]
4. You will now receive a message that states the scan will now begin. If SFC should find any rogue files that need to be replaced, you may be asked to insert your Windows CD. If the SFC scans without finding any problems, you will receive the following message: "Windows resource protection did not find any integrity violations".
5. Close the command prompt window.