Why trust only one company with all of those different functions? what if they are not as good as another? your best bet is to distribute functions between multiple programs. Personally I use AVG Free, AVG AntiSpyware, AdAwareSE, Spybot S&D, Windows Defender. If you put all your eggs in one basket and the basket has a hole your gonna break a few eggs. Besides all the software i just listed is totally free, and they won't slow down your computer anywhere near as much as Norton does. As far as firewalls go just enable windows firewall, it is functional but won't protect you 100% from getting tracking cookies and stuff but thats why you have windows defender and spybot s&d and all the rest.