Closing “about” Window

Certain web sites force the opening of a popup window with an advertisement that can not be minimized or maximized like the other ordinary windows. These windows are a headache as they do not have any Minimizing or maximizing buttons on them. This happens in MicroSoft Internet Explorer 4/5/6 (that comes bundled with 98/Me/2000/XP).
They do this by using the "about:" browser built-in command into their HTML/DHTML/XML code. If you want to get rid of such troubling windows during your surfing, then follow me. I have the fix. As usual open the registry editor and navigate to the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet
Settings\ZoneMap\ProtocolDefaults
Now right click on the right window pane. Create a new Dword entry and name it about. Set it’s value to “00000004” (hex). Please note that they are zeros and not the letter ‘O’.
Once again right click on the right window pane. This time create another Dword entry and name it about: (Note the : symbol introduced here). Set it’s value to “00000004” (hex).
Please note that they are all zeros and not letter ‘O’.
This will place all "about:" URLs into the MS IE Restricted Zone (the hex code 00000004
stands for Restricted Zone), and hence will not open anymore while surfing the net.