I dont know if the board has a PCIe X16 slot to take GPU
A Core 2 Duo in it, will likely not be able to keep up very well with a GTX 660 anyway. But if you can post your full specs, it would be more useful.
Intel q45 express chipset
Core 2 Quad 3.0 ghz 12mb cache
5 Gb Ram
Chassis Dell 960
also...