recently built a new system. Had issues with the GPU they sent me and had to RMA it. Since I have a computer laying around with a Radeon HD 5850 I figure I'd use this while I'm waiting for the replacement GPU to arrive, however, after installing the HD 5850 none of my games work and windows won't recognize my card.
I've uninstalled all Nvidia drivers/physX, basically everything that had anything to do with the RMA'd card. I've installed new drivers from AMD for the HD and still nothing.
I understand that formatting, reinstalling windows will probably solve it but I'd prefer not going that route.