adfilter for Windows is system-wide ad filtering system we developed. It brings together technology already running within the operating system in conjunction with opensource software and blacklists from Github. Because it utilises technology already in Windows, it's lightweight and works with all web browsers including Internet Explorer. It even block ads within other programs that utilise HTTP to display them. Whether you are using it on a child's computer, or every computer in your business, it's free! No subscriptions or fees.