The only Norton product that I use is Norton Power Eraser. This piece of software is excellent for the one time removal of malware such as rootkits. Have not needed to use this except on computers people bring to me to fix.
I use an old computer I purchased for about $20 as a firewall. ClamAV, HAVP, P3Scan, along with iptables provides my network with real time antivirus protection. In addition, I run Microsoft Security Essentials on each of the Windows boxen that are located behind the firewall. So far, there has not been any problem with this setup. However, I can also run Malwarebytes Antimalware on any computer on which I suspect malware. HAVP is configure to block all executables from being downloaded with the exception of update software. If anyone in my family wants to download software, I can do it for them after I check out the software to make sure that it is not malware.
In addition, I perform regular Java, Flash, and Acrobat Reader software updates. I also disable Javascript in the Adobe pdf reader software. In addition, I recommend people use (Google) Chrome or Firefox as their default browser and Thunderbird for their email client.
As a published author with three decades of I.T. experience, I do have to say that properly configured computers running free software are more secure than those where the owners depend on the latest whiz bang and expensive software to protect.