Check your disk for errors
The windows error checking tool (Chkdsk) can identify and fix some basic hard disk problems.
To run it, open My Computer, right-click on your system drive, select properties and click the Tools tab. Click, “Check Now” and tick “Automatically fix file system errors and scan for and attempt recovery of bad sectors”.
The program can’t correct certain errors whilst the disk is in use so schedule it to do it the next time the computer restarts!
