Hello,
Whenever i try to change the resolution, the game crashes (program stopped working) And my default is 1680x1050 and i want to play at 1280x800.
Now how can I possibly change this outside the game? I know that the game command is "r_mode 3" but when i put this in console , nothing happens.

Can anyone help me?

I think downloading the latest nvidia beta drivers will fix this. If you have a nvidia card of course.