If there were an adblocker for IE the only kind would be some kind of a tool bar. As an Network Administrator I have seen a tool bar that I didn't remove as fast as I could. The best Adblocker is called Adblocker Plus and it is a great tool, but is for Firefox and it is free. https://addons.mozilla.org/en-US/firefox/addon/adblock-plus/
Just a question to you Philip as your answer - could a person export the list from adblocker into a Host file and then have IE run throug it as a Proxy Server? It has been ages ago when ads first starting to appear that you would create a Host file and then have IE check that first to see if it would allow downloading from it. Even though it might be a stretch due to so many firms now doing ads - where is that info?