Cryostaisis shut down.

[BAXTER STOCKMAN]

Guys i have some serious problem with cryostasis. I am on level 15 and my pc shutdown after no more than 10 minutes of gamplay... That why i havent finish it yet. It took me more than a month to reach level 15 and that because my pc shutdown when i am playing this game.. I overclocked the gpu fan to 100% with Riva Tuner but it dosent help.. If i overclock the cpu fan will it help? Why this problem?? I dont have any problem with others 1c games and pc games in general. Is it safe to overclock the cpu fan from the bios or is better to use another program to do it? What is strange is that the gpu temprerature is already 60C even when i am not playing any games at all!!