New
#1850
Yeah Key ends in 66T on my Laptop thats running Windows 10 Pro. It also displays Original key but Original edition says "Key not supported by this OS" and OEM Key says "Windows 7 OEM marker present in firmware.
On My Windows 10 PC which I clean installed after upgrading from Windows 7 pro to Windows 10 shows different key altogether. Before clean install it showed Key ending with 66T however after clean Install it has new key. It does not show original key at all.
After typing slmgr /xpr is CMD both Laptop and PC say windows 10 pro is permanently activated.
Original key won't show on a clean install because its read from the Windows Registry. No previous OS means no stored key for that OS. that's interesting that the key changed on a clean install. Have you googled the last 5 characters to see if it shows up on the Web? I've been thinking of doing a clean install on one of my desktop PC's. It went from Windows 7 to 10074, then every build after that to 10240. 6+ upgrades via windows update.