No, don't do what Reaver suggested! Honestly, most free forums are useless and unreliable. (I apologize, Reaver, but I've learned from experience.) However, if you're a cheap bass-terd, and you just want a community, no matter how bad and unreliable it is, the best would be
http://www.invisionfree.com/Honestly, InvisionBoard is really, really exceptional and of high quality. It's just that it's extremely expensive and I don't think you'll enjoy it in the long run.
Although I think you will enjoy phpBB. The world largest forum in the world:
http://www.gaiaonline.com/forumuses phpBB and I guess it shows how hack-proof it is.
But anyway, good luck with your forum endeavors and I hope my help is, well... helpful to you.
Did I forget to mention:
http://www.ultimatebb.com