Can you still use the database? Can you look at the design of all the objects? Do you have to enter a user id and password when you open the database? What exactly are you not able to do? Does the database need to be secure?
Just try this and see if it works:
Open up microsoft access (not the database in question) and click on "create new file" - or open the "file" menu and click "new" - then click on "blank database".
Once it opens, go to "File", "Get external data", "Import" - then select the database that's locked. When the import wizard opens, go through each tab and select every object. Then import it. If you're able to import
every object in the database, you should now have full control of the database.
If you're automatically prompted for a user id and password when you open Microsoft Access, you're going to have to create/join a new Workgroup before you import the other database - otherwise you still won't have administrative rights to the db.
Go
HERE to learn how to do that and a little more about access security.