I played guild wars, i played off a cheap stock computer with a half gig of ram, and i ran it pretty good. you just have to pay $20 for activation, and its free the rest of the time. my friend played it as well, off of a real piece of crud computer, i mean things showed up as plaid and bright silver, but he still ran it fine.
AAANNYYY way... Guild Wars doesnt take alot to play. $20 and a decent computer, and you got a good, 3d, mmorpg, largre community, different classes, good customization overall, pvp and pve. its not a bad game. when i compare it to WoW, its less cartoony, and a hell of alot easier to run