hey i play all the games in high settings i never have problem before only with this game and i dont know why after 1-3hours of gameplay random times the game is freeze i cant cttrl+alt+del i cant do anything i need to restart my pc i run the program afterburner to see what is going on with my gpu and the game even in the low setting use 97 % of my gpu

here is my pc
ram 8 gb
AMD Randeon HD 6800
AMD FX(tm)-4100 Qua-Core Processor 3.60 ghz

Really does sound like your PC is heating up.

If you haven't cleaned the dust from the inside, including the case fans, CPU, Power Supply and GPU fans - do so. A can of compressed air works well, but I suggest you do this outside as you may be surprised at just how much dust can accumulate inside the box.

If you still have issues I would suggest running a temp proggie while playing so that you can see what the temperatures are. The game can be quite strenuous on your hardware.