You would need to run the install correctly to import the vb
usergroups that is step 4 where you specify the correct table prefix for the vb
You can also if you are familiar with phpmyadmin just insert a record in pp_usergroups with name Administrators groupid of 6 and cpaccess of 1. That should get admin in and then you can use the resync usergroups option under edit usergroups in admin to pull everything in.
As far as