Update boot problem

[Twilatrejo1]

Windows 10 told me to update when I hit the button it did the update and just continues to reboot but will not stop and shut down the system and turns it on continually.

I ran a diagnostic on it and it ran the same diagnostic test for 17 hours over and over again says everything was fine. I am trying to do a restore but I cannot recall my admin password this computer is older but it has been used less than 12 hours I am very disappointed I need help.

[WAWood]

@Twilatrejo1 

First off, we can't help you with the Admin password -- which is why you need to write these things down.

Second,  

this message nearly always means that a recent Windows Update failed and Microsoft then tried to recover from that, but that failed, so it's trying over and over again -- and will never succeed because Windows Update got corrupted in the process. Unfortunately, this is NOT a new issue with Win10 Windows Updates.

This problem is very difficult, if not impossible to fix -- from the standpoint of making repairs and leaving your stuff intact. Some steps for trying this are listed below, but they are very hard to do and if they do not work, you are faced with doing a complete Windows reinstallation to get your PC back working again.
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First thing you need to do is see if you can restart in Safe mode -- by doing these steps: https://www.tenforums.com/tutorials/2304-boot-into-safe-mode-windows-10-a.html

If you don't know how to start using Advanced Startup Options, then read this: https://www.tenforums.com/tutorials/2294-boot-advanced-startup-options-windows-10-a.html

Then, follow these steps to reset Windows Update: https://www.tenforums.com/tutorials/24742-reset-windows-update-windows-10-a.html

If these work, when you finally reboot, you should then be able to login to a working Windows desktop.

If these don't work, then report that back here as we will then have to provide you information on reinstalling Windows.