Need help! (Vista)

Hi

So anytime when I stay at the character selection screen for an extended amount of time (About 30 seconds) the screen just freezes on me and after a bit it restarts

Has anyone else encounter this?

My comp specs:

Processor:
Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz (2 CPUs), ~2.2GHz

Memory:
2030MB RAM

Hard Drive:
120 GB

Video Card:
NVIDIA GeForce 8600M GT

Possibly a problem with not updating the display driver? (Maybe can someone link me to the correct update for it?)