Decided not to continue with WP-Forum (styling a bit faint and many other reasons) but found the delete routine did not tiday up properly.
If you decide to delete it, you'll need to manually drop its 7 tables from your database.
The Forums plugin scene needs a candidate between Simple:Press (far too overwhelming for our clients to navigate) and BBPress (too basic and a bit primitive looking.)
Vanilla discarded - depends on a remote server.
Tal.ki and Mingle discarded - too much flak around them.