My computer won't boot... need help with the startup via ope

[Gardor]

My computer keep on hanging and then restart when I open any games. I scan it with mcafee anti virus, and my computer has no virus, scan it with superantispyware and no threats found. I also used kaspersky rescue disk, and nothings found. I format my computer and install a games, and it hangs again. By the way, I think the games is not the problem, it is on my computer but I don't know why its hanging and restarting now. Help me pls. THnx, Happy new year to all. lean system 7 reviews