I have had not much success with Norton of late.
Other programs catch stuff, Norton doesn't.
The 2006 I just tried has more pop-ups and full window stuff, will dump all your browser windows if it doesn't like something (caselmedia for one) so I tried several, settled on AVG, pus it's free.
Norten is bugging me to upgrade my Internet Security 2005 which is paid up through September of 2006; they want to sell me the upgrade to Norten Internet Security 2006 from 2005 for $49.95. Should I really do this? Is it worth it? If I keep my NIS 2005 always updated with current definitions shouldn't it protect me just as well without my having to spend another $49.95 for what seems like never ending annual upgrades?

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