Are you looking for intrusion software for non-tech savvy people?
If you're looking for intrusion software and labeled this thread "hackers", I'm going to go on a rant about how "hack" is the most commonly misunderstood word and start referencing the Jargon file everywhere.
Microsoft Security Essentials is probably the simplest free antivirus you can use and it is the most trouble free.
Avast, AVG, Antivir, Comodo etc all gave me problems like computer slow downs, random wake up from sleep or hibernate. After switching to Microsoft Security Essentials I no longer get as many slow downs then third party antivirus.
Thesedays I just use Ubuntu Linux 10.04 whenever possible to avoid tWindows Viruses, and just use the default bundled software for Ubuntu, or popular software like FileZilla, Chrome, FireFox, VLC on Ubuntu.