The status (popups allowed or disallowed) is displayed on the Norton AntiSpam interface. A window like the following should appear:

To disable pop-up blocking: In the main window, on the left hand side click Norton AntiSpam. Click Pop-up Blocking > Turn Off.
To enable pop-up blocking: In the main window, on the left hand side click Norton AntiSpam. Click Pop-up Blocking > Turn On.