So I lucked out on a recertified GTX 280 and surely going to RMA. It crashes everytime I get into Windows. I've been troubleshooting this for 3 days and I thought the problem went away because after I went from Win7 build 7100 to 7600, it no longer crashed. But it was only a matter of time for it to crash at desktop again, once it purple screened in L4D. I searched up "gtx 280 purple screen" and other people had the same problem. I think I'll be getting another recert. card from Newegg. Hopefully it'll work.