I've never had anything but problems with Norton. I switched to McAfee a couple of years ago, and have never looked back.
Norton's shit always slowed my computer down, and it took ages to trace every little fucking thing it was trying to do at start-up. They also continually release software with known issues that cause booting to take up to ten times as long as it should.
The last straw was Internet Security 2002, which completely blocked me from using the internet, and wouldn't let me change preferences because I didn't have administrator status within Norton. Well, there was no way to make myself an administrator, because they'd taken that function out, but forgotten to remove the requirement for changing preferences. And I couldn't remove the damned thing, because you could only uninstall if you had administrative privileges.
I finally found the instructions to remove it manually.
And that was the last time I used Norton.