I'll give you the same response I usually give in this situation - so excuse the generic ness. In the mean time - can you give me your system specs? While you wait for me (or others) to reply, here's some stuff to try.

Normally when games crash it's either one of three things (from my experience). 1) a setting such as performance mode which makes the game force quit after hitting Xx% of CPU usage or if the FPS dips below a certain rate. Make sure performance mode is off. See if that helps. 2) overheating. Overheating is such a broad range of contributors which makes it hard to pinpoint. There are plent y of free software programs to check your pcs temperature to see if it's overheating. 3) the GPU. less common due to the fact that most people with the wrong GPU can't even get into the game, and if they are playing games on PC they usually have a decent one anyway. Let me know if any of these helped.