seekayes,
You are very fortunate and unique in my experience to have no problems with Norton AV for Macintosh. I've seen scores of Macs rendered unusable by Norton. In 100% of those cases, the problems with the Macs were sorted by switching off and ultimately removing Norton.
Norton will indeed catch many viruses - none of which will harm your Mac. They are inert on your Mac and will cause it no harm. The one merit of Norton is that it will catch a virus and prevent you forwarding it to a PC user, whom it might hurt. However, all the viruses I receive in spam are visible as attachments, so it's simply a matter of not forwarding them on to anyone else.
Applemacster