I'm having problems with my SEK version of SolidWorks 2014-2015. When I try to open SolidWorks, I get the following error:

I know for a fact that my Serial Number that the university is giving me is valid, so how do I reset the software to plug it in? I must have failed to activate it the first time and my 30 day trial ran out. Uninstalling and Reinstalling does not help, even if I clean the registry and all program data. (I even dug through the registry manually, deleting everything SolidWorks related.)