I know we've all seen that..
I just built this system. I have Vista Ultimate on there, and I'm getting the BSOD while Vista is loading. This first started happening after adding more ram onto the setup. I have four sticks of Crucial Ballistix altogether. Each being one gig. I think it was at three gigs that I started getting the problem.
I made ONE successful boot with all four sticks in. I got hyped, installed some drivers for the mobo, network shit, and as I'm rebooting, the same BSOD came back.
In my opinion, I think I have one or two bad sticks of ram. I'd like to know what someone else thinks.