1. Log into your system and click the 'Start' menu.
2. Click 'All Programs' and then click on 'Accessories.'

3. Right-click on the 'Command Prompt' option and select the 'Run as administrator' tab from the menu.
4. Type your administrator password into the field if you are prompted.
5. Type 'sfc /scannow' into the command prompt and press the 'Enter' key. Wait for the computer to repair your CRC files.