First thing I would try is to do an error-check on your hard drive. Click on your "My Computer" icon then right click your hard drive icon, go to "Properties". Click on the "Tools" tab then, under Error-Checking, click "Check Now..." Then check "Automaticly fix system errors" and "Scan for and attempt to recovery of bad sectors". You'll have to restart then it will automaticly start the check. Hope this helps you.