I keep getting it every night when I play Team Fortress of all games - a game based on the old Quake 2 engine, I believe.
My specs are:
ASUS A8N-SLI DELUXE motherboard Club 7800GT Graphics card Generic 2mb Samsung memory 4800+ x2 CPU
I have unistalled and re-installed the current NVIDIA drivers 81.95 and made sure it is a full and clean install, and it is the only game I get it on. Both BF2 and Splinter Cell: Chaos Theory - which are graphically superior have no problems at all.
I have not overclocked anything and have the graphics on default settings. I am concerned that the first stop code is to do with memory allocation error but I do not know for sure.