When trying to launch Vegas 18 this morning I am receiving a message to activate. The serial number and my email address are already populated in the activation fields. When I click on the "activate and register immediately online" button, it tells me the serial number is already registered (which it is). The only other option is to exit the program. How do I fix this? Do I have to uninstall and reinstall the product? I am running Windows 10 operating system and up until today the software has been working correctly.