Civ4 Complete graphics issues.

[Amelza]

I just got Civ4 complete today. It installed fine with no errors, and I downloaded the patch update (I think), but once I got to the game screen after making all my choices, the graphics went all haywire and I was unable to click anything until I exited the game through the task manager. From what I've seen in other posts, this seems to be a common issue. I turned down all the graphics and disabled the animations, and the graphics still go all screwy almost immediately upon getting to the game screen.

My specs:
nVidia GeForce 9400 GT 1GB
Intel Core Duo E8500 3.16GHz
4GB RAM
WinXP SP3

Can anyone help?