Currently I'm using some free AV's
All on different computers mind you
Would you like to try a free one and see what you think about it?
I have one I'm very happy about lately
It powered by Kaspersky's, which has a good reputation
What version of Nortons do you have presently installed
If you want a paid version, many are happy with NOD32
I don't use it but hear good things about it
Again, it's only opinions