I have a dell laptop that came with windows 8 (OEM) I upgraded to 8.1 and yesterday I had to reinstall the windows so I created a windows 8.1 usb using an iso from the internet (windows 8.1 pro 64 bits which is the same version that I had) but my windows 8.1 installation didn't recognize my windows 8 OEM key so I used the Windows 8.1 default key to complete my install, off course the default key is invalid but my windows 8.1 wont accept the OEM key that I found cracking my bios....

How can I make windows 8.1 accept my OEM key?

marked as duplicate by Karan, Moab, DavidPostill, Mokubai Jun 1 '15 at 6:33

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Windows 8.1 is not Windows 8, and the license should not work. (generally)

What you would need to do is install Windows 8, reuse your license (OEM key) and then upgrade to 8.1 from there.

Although, there are various work-arounds that work at least sometimes.

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