Did you verify the installation? Would hate to say download it again, its huge. Might want to check on the discussion section for the game to see if others have the same issue.
I did and its funny you say that because I did uninstall and reinstall and nothing. I've tried listening through my headphones which work for other games and nothing. I've been looking around, but it seems like the solutions fix other people's issue with the problem and not mine. Very very odd.