Despite rumours to the contrary, I am not a forum software expert. lol

Can anyone recomend a good robust and easy to set up forum software package and/or advice ?
Has to be free as I am on a budget of zero...LOL

I have webspace with a dedicated server running apache, sql 4 and php 5.

I have looked at PHPBB but how far has that come since those data base error days ??? ...LOL

Only legitimate free software please...
Thanks