lets see if its the hard drive causing the problem
Manual steps to run Chkdsk from My Computer or Windows Explorer
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,
* 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.
Note If one or more of the files on the hard disk are open, 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....
NOTE..DO NOT TURN OFF YOUR COMPUTER WHILE CHKDSK IS RUNNING OR YOU CAN HAVE SEVERE PROBLEMS..
this can take a long time and may even appear to hang at a % and stay there for 20 or 30 minutes ...it may even back up and redo a section...this is OK..