1. Open the 'Start' menu and click the 'Computer' icon. Right-click C: drive, or any other drive you want to check, and click 'Properties.'
2. Click the 'Tools' tab in the window that appears. Click the 'Check Now' button in the Error-checking section. You may be prompted for your password.

3. Click the 'Automatically fix file system errors' and 'Scan for and attempt recovery of bad sectors' check boxes to check the hard drive completely and have errors fixed for you.
4. Click 'Start.' The process may take some time with large hard drives and will run faster if you don't have other programs running at the same time.