I removed all the previous drivers in safemode, then used a program that was supposed to remove the little bits left over while in safemode again. Sadly, I find moving from ati to nividia (rarely the reverse) always results in a re-installation of an OS.
The BSOD looked like a terminal IRQ dump. I think the computer received a request from more than one video card at one time. My system has a built in gpu (may have installed a driver when flipping cards), probably some bits from the ATI, some bits from the 250gts and the 460gtx.
The BSOD came up after 1hr of painting in mypaint regardless of any other programs running in the background. At first I thought it was having my mouse and my bamboo connected at the same time. Removing the mouse didn't affect a change. At best, I could work 1hr before a crash when I wanted to sketch or paint. I also begain experiencing glitches in EVE that weren't there until I installed the 250gts and increased once the 460gtx was installed.
I haven't run any tests to stress my system since the re-install. I am kind of affraid to in any case. In my experience, most BSOD related to burned out HDD, bad RAM, or one or more capacitors on the mobo being junked. When the 4870 died it could have been from a voltage spike rather than old age. In any case, I should know from general use whether or not the BSOD will continue. If they do, I will likely need to build a new system.