It is the exact same pop-up every time or from the same site?
If so, which site is it?
If pop-up stopper isn't working for it then it is installed on your computer as opposed to being sent to your computer from an external site which probably means that adware has been installed on your computer.
Pop-up Stopper is designed to stop pop-ups that originate on a site. Adware/spyware installs on your computer and tells your computer to go to a particular site.
If that is the case then you'll have to download and install programs that are designed to prevent spyware.
Click the link at the top of the thread to read about adware/spyware.
Guess what I just did? It blocked my FR pinger, but after seeing it happen twice, and finally being able to read the whole message, I held the Ctrl key down and clicked on my pinger and it came back!!
The pop up, 95% of the time, is www.usmilitary.com