I assume you mean that the file is corrupt, not physically displaced. First,
always work on a copy of the database. Working on the original may make it
impossible for a repair service to fix it.
for some suggestions. Unfortunately, some corruption cannot be fixed - you
may need to create a new database, import what can be salvaged, and recreate
the rest.
Although it's a paid service, Peter Miller does an outstanding job of saving
corrupt databases. Try this URL: