That helped me as well! Thanks! Have you tried raising any of these higher to find out the absolutely minimum it needs before it starts crashing? I tried raising the first one to medium and it immediately locked up again, so I'm hesitant to even try the others.
Same problem here - everything was working OK until I tried running World of Warcraft. I can log in and get all the way into the world, but after a second the whole system locks up with the background music playing. Nothing but a hard reset gets it out.