If it overheats I don't think the game would simply freeze up - the entire system will. You won't be able to <crtl><alt><del> to close the game, the system will be too slow. I'm willing to bet unstable graphics card or RAM due to either overclocking or faulty/old memory. It sounds a lot like a graphics card running out of memory. Try dropping the settings a little (as HEXiT mentioned), specially the anti-aliasing settings (it uses A LOT of VRAM), and see if that solves the issue.
i fixed it
all i had to do was pathing it and it helped. ty for all answare's. for thoose who said turn down the video options that didnt help.
but now that all is fine i can start playing XD