I recently bought a Nvidia 9600 GT video and Civ iv was running fine until I put it in. I have PCI-e. When I put the video card in, and I started playing again the game freezes and the screen, the only way I can describe it is funny (weird). I have the latest drivers for the card. It has 512 MB.Civ IV is the only game it does this with. Any help would be greatly appreciated.The computer is a 3 Ghz Dual core with 2 GB of RAm.