Koolkat, thanks very much for your time. I've looked into dxdiag, and didn't find anything, but what you posted made me think that it could possibly be related to Nvidia Optimus (automatic switching between gpus). I heard from someone something about it being buggy at one point (he said they fixed it, but maybe they didn't), so I thought maybe it would be related to that. I've changed an Nvidia setting back to defualt.
I've also used Comodo for a long time without error, but I've downloaded MSE and I plan to try that if I get the BSOD again. Thanks again for your time and help.
I guess I'll post again if I get 2 more BSODs (1 beyond the antivirus change). Who knows how long that could be, as this one took about 2 weeks. Anyways, thanks one more time!