Can't open mdb file

[sacsasa]

I have a database in mdb format that will not open. When I try to open the file I get an error:
"The Microsoft Access database engine stopped the process because you and another user are attempting to change data at the same time"

I was the only user accessing the database and this occurred after a compact/repair.

Any ideas on how to get the db working again?

You must try JetComp.exe once to repair Access database. It's a freeware utility provided by Microsoft. For more information about JetComp.exe and how to use it, you can read this blog post: Repair Access Database with Compact and Repair Utility | N. Sem's Blog

There're few other solutions also available in this blog post which can help you repair Access database. I hope this will help you.

SacSasa