The only way to deal with this kind of situations is by contacting the Customer Care department. Access the website and then you can use the information on the website to get in touch with the company's representative or tech support. I recommend you using the ticket system found on the right side of the page.
Additionally, make sure you are connected to the Internet because it's possible the application requires online activation. However, the problem should be fixed upon a successful contact. A new key will be issued or they will diagnose the problem with your registration key.