It's more than likely spyware that responds to keywords found in certain webpages. There are numerous apps that have this tendency, and its likely that NVnews just has some of the words that trigger the popups.
Run Adaware, Spybot, and MSAntiSpyware all in safemode along with your virus scanner. Make sure you have System Restore turned off before entering safemode. Remove anything that these pick up and then reboot and come to NVnews. I can almost guarentee you that you won't see the first popup.