Problems since last update - security tool bar

Since the last update with the Norton Security Tool Bar, I have been experiencing significant delay and freezing problems with my computer.  I don't know what to do to fix this problem and am hoping someone here can help me.  I don't have McAfee on my computer, just to get that question out of the way preliminarily.  Before this update showed up several days ago, my computer ran very efficiently.  Then I did a routine reboot and noticed the new tool bar at the top of my screen with the Norton Icon and "This Page is Secure" beside it.  Next to each search result now, there is a green Norton icon indicating if the page is safe of not.  I use Mozilla as my web browser and am otherwise happy with it so I'd prefer not to change it.  Since this Norton change, as I said, I am experiencing huge problems with my computer freezing, with 1-2 second delays every time I go to click on something, as well as delays with my cursor typing into the search line.  Please can someone help me fix this.  I would really hate to have to completely uninstall Norton because it became more of a problem than a help to me.  Thank you.