Is there any way to find an old product key for windows? I first upgraded from windows 8.1 to windows 8.1 pro for students through the 'students on the hub' website last week. When I upgraded to windows 10 using installation media, windows wouldn't accept it. I then did a clean install of windows 10 home using a generic key. I tried retrieving my product key through a keyfinding software, but it only came up with the windows 8.1 pro student key which doesn't allow me to upgrade. I already checked my sony vaio laptop case for a windows 8 key to hopefully revert and upgrade from there but no dice. Please HELP!