You'd have to use ImpEx to "restore" to a basic version. That way none of your custom tables are restored.
Just use vBulletin's control panel to make a backup of your database, create a new database to work with and install a fresh copy of vB to it. Then use ImpEx on your new vB and point it to your old vB and tell it to import all of the forums, users and posts etc. Finish up by deleting your old vB's installation and replacing it with your new one.
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