After the most frustrating week of 55 years using computers, I decided that a clean install of Win10 on my relatively new Win8.1 machine was the only possible solution. Assured by a Windows Secret article that my Win 8.1 Product Key would work for activation I found what that was by using both Produkey and Key Finder. My Win 8 was an OEM product, but both programs gave me the same 5×5 Product Key.
I completed the clean install, but activation was refused.
Error Code 0xC004C003. Error description “The activation server determined that the specified product key has been blocked”.
Back to Win 8.1 now. I guess time has caught me out – I wanted to try Win10 for some of my older programs and wanted to be able to upgrade at a later date (see “Preserve a free Windows 10 upgrade for later use” by Fred Langa 7/7/16).
Unless anyone has any suggestions, I suppose Win 8 will be my OS for many years.
Robin