Unistall of NU 15 was incomplete using Control Panel or from the program folder in Start Menu. On restarting after the uninstall, there was an error message about "some Norton message could not be found...skipping auto detect" then the restarting process would continue. Installing NU 16 did not help. Tried unintall NU 16, then NU 15 could not be reinstalled. Msg was already had a newer version, though the NU 16 folder was empty in the start menu.
It became a vicious circle, and no way to remove the error message on startup. NU 16 could not be reinsalled either, clicking on auto setup, the "finish check mark" popped up, the installation had not even begun. Anyone has experienced the same situation and a solution?. Now the PC has no NU 15 or NU 16, only the annoying msg on restart.