I was pretty sure that the product key was just fine, and for some reason, Windows could not recognize it. While it resolved for me quickly, here is the list of things to try. Restart Windows PC Check ...

Windows 10 product usually works with Windows 11, but the problems occur if your Windows 10 license is an OEM license (tied to original device hardware and not transferable) rather than a Retail ...

When Microsoft first launched the Windows operating system, installing it was only a matter of copying the program onto a disk. You didn't have to verify your copy of Windows. Starting with Windows XP ...