Uninstalling Backup Exec 2012 SP2 from Windows Server 2012 fails

Hi There

I was triing to uninstall Backup Exec 2012 SP2 (SP is beta version) and get the following error:

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FATAL ERROR: ERROR 1306. Another application has exclusive access to the file
C:\Program Files\Symantec\Backup Exec\Data\bedb_dat.mdf.
Please shut down all other applications, then click Retry.
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I can not find the application wich is denying me from uninstall the Software.

I Hope you can help me with this.

Regards

Tobias