In my opinion, if you need a popup blocker you should try Panicware's Popup Stopper (either free or the companion toolbar). On my Windows box, anytime I run IE6, it has the Popup stopper companion toolbar running. You can customize it so it only takes up 3 small icons on your IE toolbar space, however it isn't free. The free popup blocker they offer works pretty much exactly the same, except it runs in the system tray and doesn't include a toolbar. The good thing about the free version (and pro as well) is that it works for Firefox and Netscape as well, and it is pure freeware - No spyware or adware. If you run XPSP2 and popup stopper, you won't have ANY popups unless you have spyware that affects both. Another alternative to popup stopper would be to switch to the recently free Opera browser, or the ever popular Firefox. Both include popup blocking for non-XP systems, and they don't cost anything as well. If you install Firefox or Opera and you still get a lot of popups, I would suggest seeking some spyware scanners to alleviate the problem.