Found this while looking for a solution to the CTD's I've been getting. Pretty good info.

Battlefield 3 (BF3) PC Crash Fix and Fixes to Freezes, Errors, Stuttering, Poor FPS, Lagging, Mouse Bugs, CTD, Launch Crash, Origins Crash

Oh yeah, I'll just turn off my firewall and disable my antivirus to play the game. Okay.

i dont crash at all any more, some one found this program for me on tbg its called EVGA Precision it will work if you dont have a EVGA made card. i just turn down the core clock and shader clock and throw the fan on at 100%, i have yet to crash doing this, when i dont do this i will crash in 5 mins.