Without having access to your system, and knowing what activities occurred to "damage" the database, nobody can giv eyou a definitive answer on the recovery possibilities.
If your DB is actually pranged (no hope of recovery) then your only option is to start off fresh.... that means a clean install and then adding any add-ons in that you require. Simply copying your current forum structure into a new install won't cut it, as the add-ons will need to be installed fresh since their necessary DB entries are not present...so why not start out that way, with a virgin install?