So I upgraded my SP3 some months ago when Windows 10 came out. Everything has been great. However, today it displayed on the desktop the message in the lower right corner: "Activate Windows Go to Settings to activate Windows". I go to settings, and it says my product key does not work. It recommends I go to the store and provides a link. I go there, and I get a UAC prompt for a something called Windows Key Changer. I click yes, it launches the Store. Then the sore sits at a message saying "your device will be genuine shortly..." but has been there all day. I have looked this up and only found posts on other sites where this happens after a motherboard change, or some other hardware event. Obviously I have not changed out any hardware on my SP3. Has anyone come across this?