Problem with popup killers and firewalls is that most websites use cookies and such to follow and see what you are doing for advertiseing reasons and these programs prevent you from accepting some cookies zone alarm can be configured to allowe particular sites to have thier cookies in your system it is kinda sad that you can enjoy what the internet has to offer with with out haveing the choice about advertiseing....but hey thats life.....you would be suprised at how much they know about you with out you even telling them