1. Click on the 'Start' button on the bottom of your screen.
2. Click the 'All Programs' menu and then click on the 'Accessories' button.
3. Right-click on 'Command Prompt' icon. Select 'Run as Administrator' from the list of options.
4. Enter your administrator password into the field.
5. Type 'sfc /scannow' into the command prompt and press the 'Enter' button. Wait for the program to repair your CRC file.