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You could create a new account with Microsoft. Though you might have to re-install windows 10 in order to use it if it's completely locked up.
To do that, you would need to download the windows 10 software on a different computer https://www.microsoft.com/en-us/software-download/windows10
Then use that other computer to put the Windows 10 installation materials on a DVD or USB drive, then use that to reload the locked up computer.