If you post the information of the computer and error that it makes in a screenie. Also another suggestion and i'm just throwing this out here, does your computer have a virus?
Have you used a virus scanner to check for a virus and Saeten's post might be right your video card isn't powerful enough.
Also, if you try to uninstall the game it crashes? I don't know what would that do with it. Most likely you might have a Trojan horse.