Norton is one of the worst culprits. What's worse is you're paying for the privilege of it spamming and scamming you. You pay for the antivirus, which, without your knowledge or consent, installs other software, like a driver updater, program updater, etc. It then runs these programs you didn't ask for, points out "problems" on your system, and offers to fix them, but if you click "Yes, fix my shit" you're given the finger, and told you have to pay an extra subscription fee if you want these "problems" fixed.
It would be less annoying if Norton wasn't also a steaming pile of shit.