Perform a CHKDSK or check disk operation on Windows 7 by clicking on the main hard drive and choosing Check Disk For Errors from the Tools menu. Alternatively, run CHKDSK from the DOS command prompt by typing in the indicated letters.
The check disk operation looks for file system errors and automatically corrects them on the main drive or removable drives. To find the utility through Windows Explorer, right click on the Windows Start menu, and choose Open Windows Explorer.
Click the Computer icon to pull up the list of drives in the right pane. Right-click the drive you wish to check, and then choose Properties. Look under the Tools tab of the menu that appears. Click Check Now to check the disk for errors. Check the Automatically Fix File System Errors box. Another option is selecting the Scan For and Attempt Recovery of Bad Sectors option. This option takes longer than the first option, and Microsoft only recommends it if there is a suspicion of bad hardware.
If the drive you wish to check is the system drive, a dialogue appears prompting you to schedule the disk check. If you choose Check on Start Up, the computer checks the disk upon the next restart.