Does anyone know of a good and free MMORPG that has low system requirements? Like, integrated graphics and 512MB RAM?

I'm looking for the best one out there that maybe my bro-in-law and I can play together (and maybe the wife).

About 2 years ago, I used MusicMatch Jukebox to do batch coversions of MP3 to WAV (or visa versa). I guess MusicMatch is now Yahoo! Music Jukebox, I've downloaded and installed the free version of this but no coversion tools! I can do one-at-a-time conversions with Nero but I'm looking for something to do a hundrew or so at a time.

Any ideas? Any help is greatly appreciated!