Hi Folks,
WSOU 10.7.3, Windows 10 pro x64, seems to be getting stuck on KB3172729.
On the first pass it appears to be installing correctly, WSOU then asks for a reboot. If you run WSOU again it again seems to install KB3172729 then asks for a reboot, and so on and so forth forever.
This post is bug/information only, don't need a workaround as I never use secure boot on any systems.