Norton can't protect your machine against everything. There are vulnerabilities at the very core of the operating system that make your system unsafe. It takes one very simple attack against your home network, and your machine is compromised.
I truly hope that people will come to understand that the bad guys are banking on their ignorance of IT security. Older operating systems are the number one method for compromise in the IT security world.
I’ve been using Norton since it was Norton Tools, back in the day, and then when Symmantec bought it. I’ve had attacks and the various versions of Norton caught, quarantined and destroyed them all. Lucky so far...