Hi, I recently bought a Dell Inspiron laptop with Windows 8.1 Single Language. I upgraded it to Windows 10 and it was activated. As it had so many pre-installed software, I decided to make a clean install of Windows 10 using the image download via media creation tool available at Microsoft's site, which says: However, after installation, activation has failed. Don't know how to proceed further. The only option I think is of restoring the windows 8.1 from the recovery disc I made before Windows 10 upgrade.