Locked out of Windows 10 PC - failed password

Friend installed WIN 10 over WIN 8.1 - OK until login today failed - password correct

Cannot find way to access network (PC in my office now) to logon to Microsoft account.live.com as requested with password failure. PC reports connected to 'Network 3' which is(?) my office network which requires password, which I cannot enter.

How do I access OS/Network to reset user password.
MARSPATHRetired EE/Computers/ITAsked:
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To gain access, use the famous pogo stick reset disk. With it, you can activate the local administrator account and set a blank password for it. http://pogostick.net/~pnh/ntpasswd/walkthrough.html describes it.

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MARSPATHRetired EE/Computers/ITAuthor Commented:
Good tip, thanks - found other sites with additional related help
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Windows 10

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