I bought this video card from bestbuy and had them install it in the store at geek squad. it worked perfectly fine when he installed it and i brought my PC home and the games are running REALLY SLOW. i went to the install version 14.4 i believe, and ill install it and reboot my computer and then it still says 14.4 is available. i was trying crysis 2 which is what we were messing with in the store. In Bestbuy i was getting 70+ FPS and at home i was struggling to get 10. idk whats going on any help?