Morning all.
Got Windows 7 installed on my render machine, copied everything I needed off the old drive, formatted it, and got poser re-installed. Other than time consuming, it was the smoothest reinstall I ever did.
No BSOD so far, so it was the video card and not the MB as I suspected.
I fell asleep at a little over 6pm last night, and slept 12 hours. Guess I needed it. Still groggy this morning.