Norton is very good but uses alot of system resources, Mcafee is much worse in resorces and detection rates , if you have a hardware firewall (router) then the best by along was is Nod32 by
Antivirus Software - Eliminate Spyware and Adware with NOD32 Antivirus from ESET , they've had the best detection rates for years ,are cheap and uses less resources than any other AV
