mj,
Try this site, it has a free program that I've been using for the last 8-9 months and I haven't had a problem with pop-ups since!.
http://www.panicware.com Hope this helps.
BTW, click on Products and scroll down until you come to Pop-up Stopper Free Edition.
{message edited to add last bit
[This message has been edited by Trumpy (edited 12-27-2003).]