

I have also re-installed office numerous times but to no avail. I have tried repairing office from the displayed dialog and also the control panel numerous times.

Happening you should try repairing your office product (System error: 0x80070005)". I try to start any of the installed office products (using run as administrator) and enter my credentials on the Activate Office dialog but I get error "Sorry, we ran into a problem while trying to install the product key. I have an Office 365 Education Plus license. I have installed successfully Office 16 but I cannot activate it on my PC (Windows 10 version 1607 with the cumulative update KB3194496).
