BSOD

First off, I have a ASUS M4A785TD-V EVO Mobo.
EVGA GTX 275 CO-OP Video card.
RIP JAWS G SKILL DDR3 1600 2x2gb RAM.
AMD Phenom II x4 3.2ghz 6400+ Black Edition.
320GB Seagate Hard Drive.

The Asus board is a Crossfire board.

When I try to install Windows 7, I'm able to get past all the installation till the last part, where it says "Installing Windows".

You know where it blinks a few times, then goes to a video thing. Well with my computer, it blinks a few times, then BSOD. I was able to get past it by using a EVGA 8800GTS that I previously used. So that was exciting. Once I got to where I can log into Windows, I installed Nvidia Drivers, I updated everything, including Windows Updates. After all that, I tried putting my gtx 275 CO-OP back in... The Windows Loading shows up.. Disappears, then BSOD again.

I'm stuck on options of what to do.. I was wondering if i made a mistake on buying a cheap AM3 board that happened to be a Crossfire board... or what.

Anything at this point will do nothing but help me.

Thank you a head of time.