Error: Failed to allocate 536870916 bytes and will now terminate.

Game has been crashing on and off for about a month or two, started working again after build 261, but then the issue still persisted. Most of the time it'll happen mid-game on the marine side during a firefight. The Screen will freeze and the audio will repeat, have to Ctrl-alt-del just to get back to the desktop. The title of this thread is the error message that occurs when the game freezes. I have the tech support .zip ready to go but don't know how to post it in this thread. I really like this game so a quick response would be awesome.

These are my PC Specs:

Processor: Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz (4 CPUs), ~3.3GHz
Video Card: NVIDIA GeForce GTX 650 Ti BOOST
Memory: 8192MB RAM