if u use nortan the speed of the computer becomes slow so it affects the work which we r doin !!!use mcafees or kaspersky its good enough!!!
I would recommend Malwarebytes which is a free for personal use and it has discovered viruses which virus programs such as Norton and McAfee have not. Link Below: http://www.malwarebytes.org/ Good Luck
You gotta have an anti-virus program, its very imporant. I've used NOD 32/Eset for the longest time, but I temporarily have Avast now.
I use Kasper sky and that works fine for me. However you can also use bid defender, that is an another great anti virus that I recommend to my friends.