First try the verify subscription option (right click the shield)
If no good better a clean uninstall reinstall from your account. Ensure you can access your account 1st. Ie go to Mcafee home site and my account. See if any licences can be activated from the subscription there.
If still no good uninstall
reboot and run
Reinstall and hopefully it will activate.
Last thing then or you can try this before the uninstall is contact Customer service link in useful links tab above. They will nut this out.