I used to get that error all the time with my old computer (Windows xp, 32 bit, dual core, 4 gigs memory). But I was recently forced to upgrade my system and now with 64 bit operating system, the problem has dissapeared (8 gigs ram, quad core and 64 bit os).  With PC , only a 64 bit OS is able to utilize all of that 8 gigs of ram that you have. I suspect the same holds true with mac.

D'oh! Why do things that happen to stupid people keep happening to me?