How can I reset the password of Windows 8 on a new computer?

I bought a computer with Windows 8 & the seller had entered admin password but they don't remember what it was. How can I reset this password? I tried the reset procedure on my computer Windows 7 & made a usb reset, but it did not work. I do not know how that reset usb on Windows 8 (without permission from the admin). Can someone help me?

Thank you
Wayne

If you purchased a second user PC the first thing to do, because it contains apparently data/settings of users is to recover as long as the factory (without saving old data) using the recovery discs or

hidden restore partition

Tags: Windows

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