Sudden Restarts

Wouldn't it be nice if Windows offerred any meaningful error messages? I think you're on the right track, as the common denominator seems to be the video system. Two possibilities come to mind - a corrupted video card driver, or a hardware failureon the video card. Try removing and replacing the drivers. If that doesn't work, try removing and re-inserting the card - it may have a bad connection, though that's pretty rare... As a last resort, if you have another card available, try swapping them.

When troubleshooting this type of problem, don't forget the obiovous. A hot cpu can cause the lock and reboot, check the cpu fan for adequate cooling. Another problem is a power supply that is less than desired. Check that you are using a surge protector, better yet a small USP. Both will help the incoming power filtering to the computer.
Finally, remove the memory and installed cards, re-install them verifying they are seated correctly.
You problems may not be software related at all...
Good Luck!!!

The first thing that comes to mind is that the CPU may be heating up,other things to check for would be a virus or update the video drivers

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