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If your computer has a single operating system installed, press and hold the F8 key as your computer restarts. You need to press F8 before the Windows logo appears. If the Windows logo appears, you will need to try again by waiting until the Windows logon prompt appears, and then shutting down and restarting your computer.

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If your computer has more than one operating system, use the arrow keys to highlight the operating system you want to start in safe mode, and then press F8.

Open Computer by clicking the Start button , and then clicking Computer .

Right-click the hard disk drive that you want to check, and then click Properties .

Click the Tools tab, and then, under Error-checking , click Check Now .  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

To automatically repair problems with files and folders that the scan detects, select Automatically fix file system errors . Otherwise, the disk check will simply report problems but not fix them.

To perform a thorough disk check, select Scan for and attempt recovery of bad sectors . This scan attempts to find and repair physical errors on the hard disk itself, and it can take much longer to complete.

To check for both file errors and physical errors, select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors .

Click Start .