moderated Used computer

Marty Hutchings
 

I have a used computer that a neighbor gave me.  It is a Windows7 OS.  It has 3 password protected user accounts on it that are using 2/3 of the hard drive space.  I don't know the passwords.  Is there any way that I can remove these accounts?  Can this computer be restored to factory fresh without a Windows 7 disk?

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