So got a dc7800 small form desktop running win7 ultimate, 4gb ram, intel core duo 2.53Ghz just bought a GIGABYTE gtx 650 so 2gb using 1.1Ghz, the fan spins but when I use the disk it says "the graphics driver could not find compatible graphics hardware". since then update the BIOS and the q35 chipset and hasnt made a change, any suggestions?