I upgraded to Windows 10 earlier on today and my windows was activated this wasn't a clean install and it was fully activated everything, I received this was the best thing to do so the computer could register the system so I can clean install without a serial key but I was wrong I used this guide (http://lifehacker.com/how-to-do-a-clean-install-of-windows-10-1720775893) to insure but now windows is not activating saying the key has been blocked I purchased Windows 8 from PC world Uk last year what have I done? I could back date and might have to, to Windows 8 again and re download all updates but this is just a pain I see the partition known as OEM that was created by Windows to insure my windows was activated from the upgrade. Is it just me having this issue?