If you are stuck on this screen and forgot your login there is a simple way to reset your device.

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Logon screen and you can not log in.

 

 

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Hold the “SHIFT” key and keep holding it while tapping/clicking on the power button and select restart

 

 

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Advanced startup. Press troubleshoot and then press “Reset this PC” 

Thanks to: http://www.tenforums.com/tutorials/2294-advanced-startup-options-boot-windows-10-a.html