Norton, many moons ago, started out as good, decent protection. It's always been somewhat of a resource hog, but they were good.
Nowadays, they're not so good anymore and have to rely on overly cautious mentions of viruses (false positives) and supposedly malicious websites. Why? Because their technology doesn't cut it anymore.
I use ESET Smart Security Premium. It's not that expensive, offers great security and you have hardly any false positives at all. It even offers a "sandbox" environment for your browsers for online banking and so forth.
Priller