I used to have a site that was in phpnuke, and the actual forums were vb based, I then changed it all over to vb cmps, which is free, and you can do a lot of stuff with it.
I now have loads of pages, and menus and stuff and it all works fine
www.bootleg.org.uk though you wont be able to see it till tomorrow or next day, as my server got humped with lots of users, and they need to upgrade some stuff, but after then it should be back online