After lots and lots of trial and error (about 4 windows installs, lots of memory swaps, hd swaps, etc) I think I narrowed it down. It seems the Marvell SATA ports are to blame. After switching from the Marvell to the Intel SATA ports I haven't had a blue screen yet (*knock on wood*); been...
I just built a new system. Asus P67 Pro i5 2500k GSkill 8gig (eco) Dual 5770 HD ATI Day started off with constant BSOD - I first thought it was the ram due to it running at 1.5v; so i downgraded to 1.35 as the specs say. It was running great - ran Prim95 for 15 min, no issues ...