I have already seen this problem a few times this week! One of the first major updates to Win10 has completely broken the computers of many of those who have installed it.
The update, codenamed KB3081424, is referred to as a “cumulative update” — intended to collect up a range of bug and security fixes and push them out in one go.
But for many users it is freezing their computers, forcing them into a loop that sees them try to restart, give up and shut off, before trying to reboot all over again. When the update fails to install, it tries to start all over again.
Because Windows 10 has a system for pushing security updates out to users, the update can be downloaded automatically and loaded straight onto computers.
See more at: http://tinyurl.com/pdb58vk and also athttp://www.independent.co.uk/life-style/gadgets-and-tech/news/windows-10-microsoft-update-breaks-computers-and-forces-them-to-keep-rebooting-10449790.html?icn=puff-7