Perhaps some of you already did so, but the ForceWare drivers end of December (81.98) solve some Civ IV texture corruption.
So if you experience this and you haven't had updated drivers installed yet, give the 81.98 a shot.
From the release notes:
GeForce 7800 GTX/GT, GeForce 6800/6600: Ground and water textures are corrupted when zooming out in Civilization 4.
So if you experience this and you haven't had updated drivers installed yet, give the 81.98 a shot.
From the release notes:
GeForce 7800 GTX/GT, GeForce 6800/6600: Ground and water textures are corrupted when zooming out in Civilization 4.