when I try to play it , it says error critical process . Can u please make it compatable for windows 8. I use to have windows 7 until we moved to Dubai and bought windows 8.
I had this issue, then i just deleted gameguard(the entire folder), and it worked for me, make sure you have the latest version and completely up to date graphic drivers.
Run as admin, and don't have anything else open at the time.
That's how i fixed mine, hopefully it works for you too.