make sure you’re not trying to uninstall live update 1st, i’ve had that problem before… norton comes in many parts. sounds like you’re on the right track though.
The start menu click on the programs by symantec this will prevent the start menu click on startup and go through the bottom of the list and go to your start menu type in msconfig that will open the list.
Antivirus from starting.
Antivirus on it wont properly uninstall with out all of the other one and take off norton go away.