I've decided to remove anti-virus from the list.
I wouldn't recommend using an anti-virus because even Kaspersky, was taking somewhat of a huge toll on my performance. In fact when I uninstalled it, my computer ran better by at least half.
Frankly, why would you need an anti-virus anyway? Just know what you download and what sites you go to. Don't be dumb and download [poo] that you really, have no idea what it does. If you want to browse the web without worries of malware, install and run Ubuntu Linux. Seriously, Ubuntu is immune to malware. Although it might be difficult for people who are used to the Windows environment. But seriously, if you know what you download, and be intelligent about it, you really don't need an anti-virus. Hell, I don't even have Windows firewall enabled. Linux has a firewall but it's all closed.
Read here for more information.
http://www.psychocats.net/ubuntu/security