Civilization IV BTS visual distortion

[colbertnation]

I'm having a little problem with Civ IV BTS. The game works fine and all, and I really have no complaints other than this:
When I initiate diplomacy, or talk to the other leaders, their faces appear distorted. Sometimes, I can't even see their faces, or sometimes only their hair. I'm not sure what's going on, but obviously there's some visual defect/distortion happening. Anyone experiencing the same problems? Or know a way to fix this? Perhaps changing resolution, etc?

I'll gladly appreciate any help. Thank you in advance!

 

[Coalman]

Turn off anti-aliasing.

 

[colbertnation]

Thanks so much.

I set Anti-Aliasing from 2 to 0, and it fixed the problem. Just out of curiosity, will this affect the other graphics or no?