Norton doesn't stop all links from being seen. For some reason it recognized those links as being to advertising. Even when I got to the banner page, I turned Norton back on before leaving and couldn't see any of the banners there any more.
I have an LP banner on my site and I can see it there without any problem. I finally decided that I had defined my site as a "safe" site to Norton, but apparently I haven't done that to LP yet. That was the only thing that made sense.
Yes, it was a hassle in this instance having that security - but it has stopped so much stuff that was irritating that I can put up with a little bit of hassle. I don't see pop up ads any more - at all. There are still a few things that get thru the firewall, but nothing like what I used to get. I finally got rid of the dotcom toolbar and Norton has stopped similar type things from being downloaded.
I regularly run AdAware and SpyBot to keep my machine clean, but they find a lot less now that I have the Norton program running. It's been worth it to me.