It is a bit hard to answer the question correctly without knowing the version of OS you are using and what version of Norton you are running.  

From my personal experience, I once ran Norton Internet Security a couple few years ago.  I experienced the same type of thing you have.  I dumped that version of Norton almost immediately.  If you have a broadband connection with a router/firewall between your computer and your internet connection, you are fairly safe without Nortnon Internet security.  There are other measures you can take without messing up your ability to see web sites correctly.

You need to go to the privacy area and experiment with turning on or off various options.  You can make Norton have different security levels for different websites if you want.  That way you can allow pop-ups or browser information for this site but not others.

It will probably take a little trial and error to get it to work exactly right.  Try messing with the pop-up, browser information, and other options.