You can't see them, but they're lurking out there ominously. They loom in all shapes, sizes, and disguises. And sooner or later, one will probably try to worm its way into your computer. They're viruses, hackers, and other kinds of attackers set on sabotaging your computer and data, stealing your identity, using your address book to target more innocent victims, and more. It's Norton Internet Security on guard and to the rescue--IF you have it installed,...