Well I have an interesting problem here. Whenever I try to launch S2, I hear the nVidia logo and then the main menu, but the screen is all black during this. And I don't mean all black as in the game is projecting black, the monitor looks like it goes into standby mode. First thought was there's something with the drivers, but it's not, since S3 works fine. Compatibility modes don't help either.

Any ideas?

Well I found the solution. I deleted the config.cfg file and I guess it reset the default configuration.