My bad. On my Core 2 Duo system here, it's called "Multi Core Support." Yeah, it'll defeat the purpose of having the thing but it might at least tell you whether that is part of the problem.

You might also consider disabling all your onboard devices one at a time if you have a good BIOS that lets you do that. Things like TPM module and that Flash Cache (aka "Robson") module if your system has those. Also, if you have it, you might try disabling SpeedStep and/or changing your CPU C-state power management to off/disabled. These may not be root cause in and of themselves but the drivers associated with them are common culprits.

And I assume you've been monitoring your temperatures?

I'm sorta grabbing at straws here but it's difficult to diagnose BSODs without a memory dump to work from. :P