I have the same issue. You can try downloading Phys/X from Nivida, I do not have the download link for that. But that may be one fix, another is trying to verify files if you are on steam. By clicking properties than finding a tab that will state verify files.
And the next game version with non-gamespy multiplayer should be coming later this summer.
[Edited by domark, 7/31/2014 9:42:12 AM]