Your installation must be corrupted and I would suggest you uninstall via Add/Remove programs and rebbot the computer. Then you should go to Useful Links at the top of this page and use the MCPR removal tool which will complertely remove any remaining traces of the McAfee software that failed to completely remove via the normal uninstall and reboot again. Next step is to login to your online McAfee account and download and install your software. This should resolve your issue for you.
Let us know if you need any further assistance.
Could you please confirm if you are still having issues activating your McAfee programs ???