Jorsoft
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WoW would probably be your best choice, very fun game and low system reqs. If you still want it to be free (as I believe Runescape is) you could try Knight Online. Basically it's a dumbed down, not as fun, severely unpolished version of WoW.
http://www.download.com/Knight-Online/3000-7541_4-10619920.html?tag=lst-4-1
http://www.download.com/Knight-Online/3000-7541_4-10619920.html?tag=lst-4-1