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Windows 8 and Windows 8.1 have different product keys. That is, if you have a Windows 8 license and attempt to install Windows 8.1 with your Windows 8 product key, you’ll receive an “invalid product key” message. You must instead install Windows 8, provide your Windows 8 product key, and then update to Windows 8.1 from within Windows 8.=== Download Legitimate Windows 8.1 ===If you need to install or reinstall Windows 8.1, you can use the tool provided by Microsoft at microsoft.com called [http://windows.microsoft.com/en-us/windows-8/create-reset-refresh-media Create installation media for Windows 8.1]. If you’re not running Windows 8 or Windows 8.1, you’ll need to enter a Windows 8 or Windows 8.1 product key. You'll also need a product key if you're running Windows 8 and trying to install Windows 8.1 Pro.