Robert,
In my experience, starting DIAdem once with the Administrator privileges after the install should allow any subsequent user without these privileges to run DIAdem without any problems.
Please starts DIAdem after logging in as an Administrator and then retry starting it with normal user rights.
If this doesn't help, please call me at (512) 683-5452 and we will look into other possible solutions.
Best regards,
Otmar
Otmar D. Foehner