OK, I see the problem (you may need to raise an SR for assistance).
The VeSys 2.0 Quick Start Component database is identical to that of Capital, and so there are parts in the database that Capital users can use (such as backshells), but these are not available to VeSys 2.0 clients (they don't get listed and as such you can't delete it). They appear on your system because you selected "Load starter data" during the installation of VeSys 2.0.
If you are trying to get to a completely empty database then there is a faster way, with the VeSys 2.0 manager and database services stopped you can rename the database (folder called C:\MentorGraphics\VeSys\embeddeddb) and unzip a completely empty one (someone from SupportNet should be able to advise/assist if you create an SR#). But you will need to manually export the parts, symbols and projects that you want transferring into this new database... the result will be no parts or codes that were inherited from the "Load starter data" setting of the installation. I hope my guidance helps, but you should raise an SR for assistance (the process of replacing the database is quick).