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I would like to deactivate the copy of Windows 8 Pro that I have installed on my system because one of cousins attempted on Install windows from the same disk and activated with same key. So, I would like to buy a new product for it. Do I need reinstall it over again?

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possible duplicate of Change the Windows 8 product key after installation? – Ƭᴇcʜιᴇ007 Jun 18 '13 at 4:02

Press the Win key, then type Run and press Enter. Type slmgr.vbs -upk, and click OK

It should deactivate the license and get you into trial, from there you can reactivate using another license

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