Well i can run it on my laptop (!)
Specs:
1.8GHz AMD turion
1 gig ram
ATI mobility x700 128mb
It runs on the very lowest settings at 800x600, and slows down rapidly when any fighting happens (not enough to put me off playing though).
Even during my processors annoying habit of dropping the cpu speed to dissipate more heat, its still fairly good.
I'm used to playing games at only just playable frame rates, i'm never able to have the latest hardware, but the bottom line is...
I CAN STILL PLAY IT!