It happens some time when you lost the password for a database microsoft access file.
As file is password protected so it will not open up without the correct password entered, in order to solve the problem you can simply use a free password revealing utility by nirsoft.net
It’s called Access PassView, the only limitation with this program is that it works for every password-protected mdb file that created with Microsoft Access 95/97/2000/XP.
Limitations Access Pass View:
1. It cannot recover user level password.
2. cannot recover password more than 18 characters.
How to use:
By Drag & Drop: You can get the password for any mdb file by dragging it from the explorer window on to the Access PassView window.