Windows 10 Upgrade icon missing after Norton 360 upgrade

On my HP DT PC with Win7 I had the Win10 upgrade icon in the task bar, but had not yet made a reservation. After doing a new Norton 360 install, the Win10 upgrade icon disappeared. Poof! Tried making a win10 reservation through the update-page-win10 notification button, but the post Norton 360-win7 won't respond to the upgrade button-click. It appears that my win7-post norton 360 isn't interested in making the win10 upgrade. Anybody got a fix for my now win10 indifferent win7-N360 PC?