Access database not open

1. The Access database is corrupted. 

>> Try Compact and repair database.

>> Try decompiler database.

>>How to troubleshoot corruption in a Microsoft Access database
     http://support.microsoft.com/kb/306204 

2. The Access process is running but the Access database is stilll invisible.

>> Hold Shift Key to bypass the start up options( AutoExec macro, etc )  when openning the database.

>> There are multiple versions of office installed on the same computer of the same system, namely without the virtual machine. Do not recommend!