Corsair TX 650 PSU, AMD Athlon II, 8gigs corsair vengence ram, ASUS M4A88TDV, Radeon 5770. I've ran Bad company 2 on this before only difference now is that I bought a Samsung 830 and am using it for OS and Apps. I already checked all my PSU cables, in fact I did them and redid it to make sure. Not sure why but when I do the patch update my computer keeps shutting down.
Edit: Computer is fine and perfectly stable with Diablo III running, and I downloaded and installed Bad company 2 through origin.
I wish I got the email for a new reply sooner...anyway as I said in the OP I've played and ran Bad company 2 on this computer before, only difference is now instead of running it out of my 500gb WD black, I'm using a 256gb Samsung 830 SSD