1. Click the 'Start' button and then click the 'All Programs.'
2. Click on the 'Accessories' button and then right click on 'Command Prompt.'

3. Choose the 'Run as administrator' option from the menu and then enter your administrator password into the field that appears.
4. Type 'sfc /scannow' into the command prompt and press the 'Enter' button.
5. Wait for the scan to complete and then restart your system. The corrupted files should be replaced.