These are piggin' pains. I had to sort a similar problem recently, on a friend's computer and another angelfire site would not go, in spite of using 2 spyware removers and Adaware. In the end the free version/trial of 'Webroot Spy sweeper' got rid of it....click here
Also, put 'start page guard' on your computer for a week or so....click here
Firewalls are useless in these cases.