I'm not sure what that is saying about your system. How much RAM do you have? Do other memory / resource intensive games also cause problems? If only BD is having problems then it is probably an issue with the game itself or a conflict with something else in your system.
Are you shutting down all non-essential programs (especially anti-virus) before starting the game?
There are a couple memory testing programs you can try;
Memtest86 /
MS Windows Memory Diagnostic 
