Two opening options to consider: run repair from the operating system cd, you will have to change your boot sequence in the BIOS to run this, as well as option 2, is to run the other repair method from the recovery console.
I'm running a windows Xp OS. I was attempting to make a backup of a DVD When all of a sudden my system shuts itself off. I restart the system it goes thru a scan disk and boots back up. I have tryed to run a virus scan, disk cleaner, spyware detection, etc... when I attempt this it keeps shuting itself off. I have also tryed to restore to another day and it says its unable to do this. Short of a low level format does anyone have any suggestions?

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