Disk Error Checker
1. Close all open files and programs.
2. Go to 'My Computer.' Either double-click on the the My Computer icon on your desktop or open the start menu and click on My Computer.

3. Right click on the drive you want to scan and then click properties. The hard drive with your windows installation will be called 'C:'.
4. Click on the 'tools' tab. Click the 'check now' button under Error Checking. This will open the disk error checker. This utility will scan your entire disc for corrupt files, errors and bad sectors and attempt to fix them.
5. Check both boxes and then click 'start.' The error checking will begin. This process can take a long time, depending on the size and speed of your hard drive. If you receive an error message that check disc cannot run because the volume is in use, click yes to schedule it to run. Restart your computer and it will run at startup.
System File Checker
6. Log in to your computer as the administrator or as an account that has administrator privileges.
7. Open a command prompt. The command prompt can be found in the start menu under all programs, accessories, command prompt.
8. Type 'sfc /scannow' without the space and hit enter. Insert your Windows installation disc if requested to do so.