: Microsoft provides generic product keys for installation purposes. However, these keys (like VK7JG-NPHTM-C97JM-9MPGT-3V66T) are meant for installation and not activation. They allow users to install Windows 10 but do not serve as a substitute for a genuine product key for activation.

If you have an old PC running Windows 7 or 8.1 that was genuine, you can upgrade it to Windows 10 for free. Microsoft’s "Get Windows 10" (GWX) tool is still functional for many legacy keys.

It will recognize your hardware ID and activate automatically.