Hostsman
http://hostsman.abelhadigital.com/
check this little app out its called Hostsman and allows you to manage a host file. From with in the program you can download 4 hosts files and update them separately then merge them together it will then block adverts known bad sites, some adware, spyware, torjans etc. It works so good at blocking adverts i have got rid of adblock plus for firefox and still no adverts, Sweet. The best thing is that no program actual runs while the adverts etc are being blocked hostsman is just a manger for the hosts file. It also blocks the above mentioned stuff system wide i.e. all adverts etc blocked from all web browsers .