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Have you always received a message that Windows is not activated message on your device?
The key that you tried o install with command prompt, where did you get that from?
Does your device have the Windows Key on a sticker on the device or are you just able to find it in the registry?
I'm sorry I got that was where you got it from I just wanted to be clear that it wasn't available on a sticker on the device as well. Do you know if your version of Windows 10 was home or Pro?