Are you the latest victim of Norton not working? If yes then you need to uninstall and then re-install the Norton antivirus software again. But so as to activate your software you need to enter the Norton product key which acts as the engine for making your antivirus run perfectly fine so as to scan the unwanted virus and Trojans that are present in your desktop.
https://www.onlineantiviruscare.com/norton-activation-key.php