Just noticed in the [PDF doc] ForceWare 81.98 Release Notes (http://download.nvidia.com/Windows/81.98/81.98_ForceWare_Release_Notes.pdf) that it fixes a Civ4 problem...GeForce 7800 GTX/GT, GeForce 6800/6600: Ground and water textures are corrupted when zooming out in Civilization 4....so it should be a good idea to upgrade your driver if it's older--previous version 81.95