As mentioned in the video reinstalling office and all the old versions you may have littering the computer, reinstall those too.

Well There's an easy way to get it all done in one step.  

https://support.microsoft.com/en-us/office/uninstall-office-from-a-pc-9dd49b83-264a-477a-8fcc-2fdf5dbf61d8

Just be sure to perform this move after it is successful.

https://www.youtube.com/watch?v=2SyKI0VrUBk