Kazzamatazaa,
The cleanest and most effective popup blocker is the one provided by google on the google toolbar. It works wonderfully as long as you don't have spyware that triggers popups. If that is the case us Ad Aware to remove the spyware. BH
Google Toolbar:
http://toolbar.google.com/
Ad-Aware:
www.lavasoft.com
Both of these tools are 100% free.