i have IE6 with Windows XP Service Pack 2 i had no pop-ups at all. i not even using any pop-up stopper of any type at all.
using:
1-Spybot - Search & Destroy (using mainly)
2-Ad-Aware SE Personal (new check every frig-day)
3-Spy Sweeper ( they redid it over better mainly)
i don't have any anti-pop-up program at all other then Service pack 2 it do a real good job killing pop-up not one got by it at all. not even flash pop-up i have not seen any of them ether.
i don't believe in them tool-bar that says they can stop pop-up why they are what i found is loaded with ad-ware cookie to them thats ICQ & MSN tool-bars. best stay away from them if you can. use Spybot - Search & Destroy it really kills them off if you fully instill it with the tree it will block bad cookies too that are ad-wares.