I use Netscape with few problems, what I have experienced is Norton's stuff causes more problems than it fixes. I did have Norton utilities once and it was the route of all evil, once got rid of everything was fine.
I have IE 5 and Netscape 4.7 side by side, only ever use Netscape, if you can use it for long enough without it crashing use smart update to ensure you have the latest bits and bobs.