When I finish typing my personal info and email address after installation of McAfee AntiVirus Plus, the next screen says my activation cannot be completed at this time. It says I may manually download my updates, but no automatic updates are available. It then says I must activate by 08/17/12, even thou my subscription lasts into March 2013. I did uninstall this prodcut a couple months ago when my internet speeds were slow and McAfee AntiVirus was causing my internet speeds to either freeze or lose internet connections.
I've since upgraded to high speed internet and now have reinstalled the software. I'm not sure if multiple installations have created this activation problem.
Try first running
If no help I assume recently you were using another AV so did you uninstallit using its own removal tool? If not do so now. Does activation work?
Then if no help uninstall the program following this method
reboot and run the mcpreinstall tool again
Reinstall from your account