HELP. How to remove Norton entirely short of destroying computer?

I have been getting reminders to update or renew my Norton ceaselessly. It force ALT+Tabs any running app to remind me and I cannot afford to renew, and no matter what setting I turn off, I still get these intrusive notifications.  I ran norton uninstall utility three times and it is still present on my computer and prompting me to renew.  I would appreciate assistance, I am very tired of this on top of already being quite dissatisfied with the product.