Cannot activate Windows 8 error key is already used by another pc.

OT: Product key Windows 8.

Hi, so I bought windows 8 pro a year ago and installed on my laptop but I recently bought a new desktop computer and gave my laptop to my sister. She didn't so I put windows 7 on the laptop for her and went to put windows 8 on my windows desktop 8. It installed fine but when I go to activate windows it says that the key is already used by another pc. Why he says this when the computer that I had windows 8 is no longer a windows 8?

You use telephone activation. The database of activation of Microsoft still has your old laptop, saved using the key of Windows 8.

See http://support.microsoft.com/kb/950929/en-gb

Tags: Windows

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