Help! System wipe is admin locked and user login password is unknown.

[Microsoft Windows]

So my dad gave me one of his old work computers. It's a Windows 7 Professional. He can't remember his password to the computer so I can't wipe the computer from the home page. I tried wiping it from the login page but it is password locked. I have also tried changing the user password but that hasn't worked either. My dad works in IT and he doesn't know what to do, so if anyone has any suggestions, please tell me.

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