Video driver resets are not often a good sign. I've only really seen this on my side from extreme GPU overclock attempts. If this is not your situation, perhaps the videocard in your system is dying/dead.
A simple way to determine this would be to remove the video card, and plug your monitor into the onboard (assuming this is possible with your CPU/motherboard) graphics.
If your setup does not have onboard graphics, do you have a spare GPU card that you could test your system with?
Some other things you could check:
-Videocard fans spin?
-Videocard temperatures are within safe margins (20C-80C).
-PSU is supplying enough amps (since this is an older build it could be possible that the PSU is suddenly not happy with you and your computer).
I understand that this may be difficult to determine if you can not boot into windows successfully.
Personally what I would attempt at this point would be to remove the video card, and attempt to use any onboard video (assuming its available).
Install Windows and see if you can successfully boot into the OS.
If this functions, clearly the issue is with your GPU (or PSU, RAM, CPU, or anything else in your computer).
Isn't trouble shooting computer issues fun?!?
On a side note, cheap PSU's were the cause of many of my computer instability issues (and destruction's), once I decided that cheap PSU's were not good, my overall system stability has increased substantially (and my house no longer smells of burning electronics).
Long story short, this sounds like your GPU going south (in a bad way). If not GPU directly (or GPU cooling), then PSU would be my second guess to your systems inability to boot into Windows.
Best of luck. Keep us posted.