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!