AdAware 6 is also good - there is a free version. www.lavasoft.de
Type: Posts; User: adrianxw
AdAware 6 is also good - there is a free version. www.lavasoft.de
Are you sure you haven't got one of those irritating spy/mal ware programs that pulls adverts?
I have an XP system on a 256k permenently on connection, and I don't get these pop-ups.