AVG free edition for AV. It is free and I believe it is better than the Nortons I used to pay for.
A lot of people and experts like AVG, but I cling to a preference for Avast, that is also a favorite of users and experts. ( it is probably 6 of 1, a 1/2 dozen of the other).
You might look at my post #7. AVG has changed greatly since absorbing Ewido.
I think a reasonably secure system can be built as I have described. I would prefer a firewall as good as the freeware NetVeda Safety.Net but without the problems. Comodo is user friendly.