It's C#, but I don't have it installed, and have no problems. Did you buy it on steam? If you did, then post your hardware/specs (you can get a list of them from te 'system info' item in the settings? menu. If not there, then somewhere), if not, then download steam (it's free), and then post them.
Also, what OS are you using, what programs do you have running at the same time, have you updated all your drivers?