Simply, uninstall Norton from you system.
Go to start menu -> find Norton (type the exact name of the software) -> Right Click on it -> select Uninstall.
Alternatively, go to Uninstall or Change a Program in the Control Panel.
Control Panel -> Programs -> Uninstall a program<sub></sub><sup></sup><strike></strike>
Select the program you want to remove (Norton in this case) then click on Uninstall button appears in the toolbar top in the top of the list of programs.