Short of contacting Technical Support, you may indeed do a Clean Uninstall/ReInstall:
I might add that it does happen on occasion,especially with an Upgrade.
Please remove from Control Panel/Programs and Features first/Restart Then use (MCPR)/Restart before going to your account to reinstall.
McAfee Volunteer Moderator
After further thought, when you (Double Click) your McAfee Icon to open. Is it (Green) and states "You are Secure",also under the McAfee Updates Tile on the Interface, does it state"Current"?
The reason I ask, is it your Windows Action Center not recognizing McAfee, or is it an Issue altogether soley associated with Your Protection?
On occasion at start-up WAC does not recognize your Anti-Virus, which is a Microsoft known issue in the past.
There is a solution to this, if indeed it is the case.
After revisiting your initial Post, if your (McAfee Update) Tile is Red, you indeed may have a corrupt Update/Upgrade.
As the user interface relies on Internet Explorer (regardless of your choice of browser) for proper function, can you make sure you have the latest version for your system installed please?
Vista = IE9
Windows 7, 8 and 8.1 = IE11
Try rebooting. You may need to reboot more than once. It's the same as with Windows, things may need to be reset for the updates to take effect, and until that happens your system is still showing that one or more updates are not present or incomplete.
Good Point in regards to try "Rebooting". Keep in mind that (Reboot) means complete (Shut Down), and after a period of time (Restart). Allow Windows/Programs to fully load. In addition a (Warm Boot) is much easier on your system, opposed to a (Cold Boot).
In other words, a (Warm/Soft Boot) is the same as (Restarting) your computer without turning off your power source to the Hard Drive.