You should probably ask your VAR to help. Do you still have a student edition installed on the computer? Did you have one installed that you removed? Perhaps something is hanging on in your registry that needs to be cleaned out.
You might try logging on as as different user and see if it still shows as a student edition.
Is your new commercial install of SolidWorks using the templates from your student install?
Check System Options > File Locations to see where your templates are being pulled from.
Anything that was created in a student version will be watermarked.
Your VAR can help you clean up your old student install.
Anna has probably nailed it. I should have remembered the templates!