Re: I don't understand
I thought exactly the same thing when I read this, Norton/Symantec should be avoided at all cost. My experience is their AV products are so resource intensive that they cause more problems than the viruses they are supposedly protecting you against.
I used Norton stuff back in the days of Norton Utilities and they were excellent and very tightly written and extremely light on system resources. With the takeover by Symantec things went downhill fast and I no longer use or recommend Symantec products for this reason.