How to kill the IE About windows that popup from time to time

There is an Internet Explorer vulnerability to which allows some web sites to open a hidden popup tracking minimized window either upon your first visit or when you leave their web site or even when you close your browser while one of their web pages is still displayed. They do this by using the little known "about:" browser built-in command into their HTML/DHTML/XML code. Sometimes this window Go undetected as these are not resizable as you come to expect of a typical window app. If you do not have anything specific with www.about.com, there could be a registry tweak that you can do. Run the Registry Editor (REGEDIT.EXE) by going to START-RUN and type regedit and navigate to [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
Internet Settings\ZoneMap\ProtocolDefaults]
and add two DWORD keys"about" and "about:" and set its value to 4.