Norton must be doing something right or else they would have gone under yonks ago. However I have seen to many slow computers that miraculously speeded up once Norton was removed and some of the computers went from a crawl to super speed. The complicated process for deleting Norton should give some indication on how invasive it is. I ha ea feeling that Norton sems to conflict with one or more common programmes on a computer and the fact that it takes a huge amount of RAM to fire it up can cause other problems. Finally, there are IMHO, much better firewalls and AV programmes around that are free and I fail to see why anyone is paying for a home AV/firewall.