you first of all what to check that everyone is out.
If you go to the File -> configure -> user settings it may tell you that someone is in that you did not know.
If so log is as them then log out and that should solve it.
Do you run any 3rd party applications to query against goldmine such as crystal, access etc, if these are still open then in cause a link, and you are unable to re-build goldmine.
I hope this helps, if not let me know..