I use Zone Alarm Security Suite. (firewall, spam-guard, anti-spyware and anti-virus). I prefer it to others like Norton because you set it up and it doesn't bother you or your software from that point. It notifies you of problems and how to fix them but doesn't attempt to take over the whole machine or operating system like Norton.
I understand you can find torrent files to "crack" the Zone Alarm trial versions to set up your own update-able fully functioning version with a 140 year license as well.