People get the wrondg impression of tha later Norton apps .. as they used to be pretty install/un-install friendly.
Things are a lot better now. When you install these days, you create an online Norton account that keeps a track on your subs.You can delete old stuff or check dates, etc.
When old subs approach run-out, it will tell you in program.
Personally I only buy NAV online for say .. 2 or 3 PC's for a year or two years.
You can now uninstall cleanly. On the old versions (pre-2009) it had services running that prevented complete uninstall unless you stopped the services in the OS. That is one of the main reasons many folks had problems.