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Help with a forum

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Hi, how would I get a really good forum like phpbb or vbulleting ? Or if anyone knows any others that you don't have to download, I d/l a phpbb2 the other week but I don't know what to do now, my site is run iwth Tripod so I don't know if I could use it or not, or if there is another way to use it so if anyone with phpbb or vbulletin or any other good forum can help please do, thanks. Needs to be free