Paranoid or just careful?

Having read about all kinds of computer trouble, involving idiots trying to be funny, I have installed a truckload of counterhacker utilities. Aside from a Firewall, Antivirus, and Antispamprogam I have started using Ad-Aware, Spybot, Windows Defender, Calling ID, McAfee Siteadvisor. Also, I am using Firefox and have NoScript installed. So far, I have been satisfied with the result. True, they make surfing slightly more cumbersome, but knowing what is going on with my computer makes it worth the hassle.