PopupDummy! 

PopupDummy! popup killer provides real-time protection from popups, adware, spyware, harmful web browser plug-ins, harmful activex installers, drive-by downloads, and web browser hijackers.
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Popup Killer 

PopUp Killer is a small program which can be configured to automatically close previously selected Windows... cool uh?
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AdsNoMore 

AdsNoMore is a pop-up stopper and banner ad blocker designed to eliminate all of the ads that disrupt your online experience. AdsNoMore will stop adware and spyware pop-ups, web popups, and block banners which will result in faster web browsing.
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AAA KewlBar - Free Pop Up Blocker 

Pop Up Ad Window Killer Stopper for Internet Explorer, AOL, and Oultook Express
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FilterGate 

FilterGate automatically blocks Popup-Windows, Banner-Ads, Privacy-invasions, Adult-content and more. FilterGate comes in one easy to use package offering you cleaner browsing and peace of mind.
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Pop-Up Stopper Companion 

Stop Internet Solicitors, pop-up windows and Online tracking with this handy browser toolbar for Internet Explorer. Pop-Up Stopper Companion provides more efficient pop-up and pop-under blocking technology in an easy to use Internet Explorer toolbar
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