>I really don't think it is IE 5.5. I've been using 5.5 for quite a while and do not have a problem with popup ads.

My last comment on IE5.5 was just related to some bugs not the pop-up ads. IE 5.5 amoung other things would bleed the screen if the browser refresh during a page scroll. There were a few other issues including general crashing with strange errors. It just doesn't appear to be ready for prime time.