what are your specs?
is it a legal copy?
I think it freeze because it'a not a legal copy, I got it that way and it freeze suddenly, and i have to close the process then continue playing, my specs:
Phenom X4 9750 2.4Ghz (no OC)
4Gb DDR2 800Mhz
ATI HD 4890 1Gb GDDR5
I play it at 1650 x 1050 with all max and the game it runs perfectly but anyway it freeze suddenly, and i have to start again, If you want to play it without problems get the original or contact the game support.
But anyway this is not a game for me, I have to take decisión in the real life I just want to shoot someone in the games not make my way, i follow a lineal game, for decisión I have the real life.
Good game anyway (just not my like i think).