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Boot your computer off Windows 10 installation disk and you can reset the password using this method:
http://www.top-password.com/knowledge/reset-windows-10-password-without-reset-disk.html

Or use Offline NT Password & Registry Editor:
http://www.chntpw.com/download/

If you forgot the password of a Microsoft account, you can reset it through Microsoft password reset page:
https://account.live.com/password/reset