I just got San Andreas and everything is peachy except for the crharacter models. They get partially or fully invisible about 2/3 of the time. Most of the time they appear as checkerboards of visible/invisible or they will have an outline with a littlecolor inside. Sometimes though, they will be totally invisible, only distinguishable by an object being carried. It's really annoying, and can lead to problems when I'm using a two wheeled vehicle. It isn't a graphical problem, I think. I can't seem to fix it. Any help would be greatly appreciated.

EDIT: My graphics card is a ATI Radeon 9200 Series (128 MB) with an 17" LCD monitor. Any ideas about the Resoultion/Anti-Aliasing Setting would be helpful too.