fingers crossed!

Sounds like Access mdb file is corrupt. You may be able to recover it via tools>Database>Repair and compact.

Open access, find that option and try it.

Otherwise I hope where you have stored it backs up that area, if so see if they can retrieve a working copy.

You may be able to import the tables to a new mdb, but the corrupted one probably won't come across/will break the new mdb.

Have a go n post up what happens