The game doesn't launch on a GeForce 7600GT.

I have a 6600 and everything runs fine. Try installing older drivers, but don't forget to uninstall the current ones first. I had the same issue with another game.
I used to play Far Cry with a Radeon card. I switched to a GeForce and started experiencing issues – blue mountains, yellow walls. I installed a licensed copy of the game, and everything started working normally.