I just did a fresh install on a notebook, but I'm unable to activate windows. I didn't enter a product key during installation. But when I checked the activation page after install, for some reason there is a key already entered. I've tried changing the product key but it refuses to do so, it shows the same key that appeared from nowhere (the last 5 digits at least) I attempted to change the key from gui and command line as well, it still proudly displays the old key, even after rebooting. What's going on?