Was updating MB other day (ASUS K8V-mx)---TONS of grief with new drivers, (alas, unless you manually EXPORT the old drivers, they lost forever) Asus has a zillion, and I cant be sure which one it is, sans process of elimination. What happens is video freezes for 10-15 seconds or so (doesn't seem to be dependent on environment).....get 50+ frames most any time.
ASUS K8v-MX/ Atlon 3200
GEforce FX5700
1 gig ram