Demo worked, full ver. wont

[Buff]

The demo worked great, no probs at all. When first loaded, the full version made Julie, and all the buildings look like zebra striped. After reinstalling full version and patch, as well as updating driver for my ViperII, all I get is "This program has performed an illegal operation and will be shut down" both in safe mode and reg mode of the game. Please help! Thanks!

[Aquatarkus]

First try throwing out your config.cfg file and try running it again.
If this doesn't work, search through this forum for video card tuning help.