Fred, Norton antivirus is a very resource demanding program, and for that reason alone I would also recommend AVG. I had Norton antivirus installed on my computer, but uninstalled it many months ago as recommended by many people. I have a Q6600 quad core 2.6 GHz Pentium with 2 GB of RAM, and since I've uninstalled it, even my wickedly fast computer has improved immensely, and I've gained about 300 MB of RAM. I would recommend AVG with Zone Alarm Pro, which is what I have and not only will your system be faster but it will also be more secure IMO.
