Trying to install on IIS7

[mikeJS@codeplex]

Hi I have got to this part of the instalation

Now right click on the newly created virtual directory and choose Properties. In the properties dialog, click the Configuration button and add the following mapping:
Executable: $WinDir$\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll (replace $WinDir$ by your Windows directory - usually C:\Windows) Extension: .php
g. Go back to the virtual directory properties and switch to the Documents tab. You can optionally add default documents (for example index.php, default.php) that will open when clients specify no file.
h. Close the properties dialog. Your web site should now be set up for Phalanger.

however when i right click on the new virtual dir I do not have the options suggested

please help

Mike