Not to bring coals to Newcastle, I have an NVIDIA 6200 which came with my
system. I bought the system in May and until Friday, October 26 it worked
fine. On Friday my problems duplicated yours (strange graphic display,
display driver death, constant reboots, and eventually the MS-DOS BSOD).
Microsoft sent a notification that the problem was with NVIDIA, but I just
installed 3 drivers including a Beta. No luck. Rather than casting blame it
might be a good time to coordinate a solution. My system is effectively dead.
The only solution that I can think of is to scrub the partition and reload
the initial OS and software, and disable automatic update, although I just
might go out and get Windows XP which seems more reliable. If you get this,
maybe you can respond by telling if your problem is fixed and how you fixed.