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?

• Edited by F1reStorM 13 hours 11 minutes ago

You cannot use an 8.0 key to activate 8.1  You need to install 8.0 activate and then upgrade.