I used to run Norton/Symantec AV/FW and upgraded every year. Then a mate told me about Avast (free version) and I swapped. Avast was pretty impressive compared to Norton/Symantec and had the added bonus that it was free.
However, I felt that I should look for something paid. I felt strongly that if I paid for an AV it COULD be a better choice, if I chose the right AV. On these 'ere forums, NOD32 was repeatedly recommended. Weirdly I've seen plenty of Avast v NOD32 threads and nearly every single one has ended up with NOD32 winning, if that person was prepared to pay, if not, then pick Avast.
I bought NOD32 on a one year licence, which I now regret. Should have gone for a two or three year licence!
I find NOD32 to be brilliant mainly for ease of use, its interface, lack of impact on system resources etc.
NOD32 has scared me at times by not visibly indicating that it had been looking for or downloading new updates; however a manual check revealed that it had been doing so and only once have I ever managed to update NOD32 manually.
Every other time I get a message telling me that NOD32 is up-to-date.
So if you are willing to do so, ditch Norton and install NOD32. I have NOD32 paired with ZoneAlarm Pro version and I have had no problems so far (touch wood).
I just remembered whilst writing this post that I ditched Norton part way through a licence period, I didn't even wait for the end so if you want try out the NOD32 demo now and if you like it buy a licence.