I find Norton (& McAfee) far, far too intrusive for very little gain. Personally I don't run any anti-virus software. I have a firewall (well two actually - one on the router and one on my PC) and a selection of cleanup tools to hand which get run regularly to clean out tracking cookies and all that sort of stuff, and as needed to cope with the very rare (far less than once a year) occasions that I might get infected by a virus through carelessness. If you are reasonably computer-literate and you use common sense then viruses are really not a major threat. But as with so many aspects of the control/government by fear that was being discussed in another thread, there are huge profits to be made by encouraging people to think that there is something to be afraid of. If even a tiny fraction of that sum was spent on simple user education then the net effect would be the same or better.