Anytime your system locks up, or reboots suddenly, or is not shut down properly by clicking START, SHUT DOWN, SHUT DOWN, you should run CHKDSK. If you suspect your system is having problems, run CHKDSK. If you think about it, and haven't run it in a while, run CHKDSK.
1. Double-click My Computer, and then right-click the hard disk that you want to check.
2. Click Properties, and then click Tools.
3. Under Error-checking, click Check Now. A dialog box that shows the Check disk options is displayed,
4. Use one of the following procedures:
* To repair errors without scanning the volume for bad sectors, select the Automatically fix file system errors check box, and then click Start.
* To repair errors, locate bad sectors, and recover readable information, select the Scan for and attempt recovery of bad sectors check box, and then click Start.
You will receive the following message:
The disk check could not be performed because the disk check utility needs exclusive access to some Windows files on the disk. These files can be accessed by restarting Windows. Do you want to schedule the disk check to occur the next time you restart the computer?
Click Yes to schedule the disk check, and then restart your computer to start the disk check.