A family of Microsoft relational database management systems designed for ease of use.
You'd have to remove User Level Security on the database. That can be tough to do if you don't have the original .mdw (Access Workgroup file) that you used to secure it.
There are some services that can remove security for you, like www.everythingaccess.com. You'd have to prove that you own the database, of course, and there is a fee involved, but Wayne could definitely do this for you.
There are also some utilities that claim to be able to remove security. I'm not sure how effective they are, so really couldn't tell you which of those would work.
Only other suggestion would be to try to import from that file, but if you're getting the permission error you probably won't be able to do that either.