Boot your computer with Windows 10 install DVD, you can add a new administrator account so you can regain full access to your system:
http://www.chntpw.com/reset-forgotten-windows-10-password/
If you don't have a install DVD, you can download Windows 10 ISO image from Microsoft's website (it's free to download), then burn the ISO to your DVD.
https://www.microsoft.com/en-us/software-download/windows10
Boot your computer with Windows 10 install DVD, you can add a new administrator account so you can regain full access to your system:
http://www.chntpw.com/reset-forgotten-windows-10-password/
If you don't have a install DVD, you can download Windows 10 ISO image from Microsoft's website (it's free to download), then burn the ISO to your DVD.
https://www.microsoft.com/en-us/software-download/windows10
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