This is an old revision of the document!
http://technet.microsoft.com/en-us/library/cc772350(WS.10).aspx
http://learn.iis.net/page.aspx/701/enable-fastcgi-support-in-iis-7-on-windows-server-2008-windows-server-2008-r2-windows-vista-or-windows-7/
http://learn.iis.net/page.aspx/246/using-fastcgi-to-host-php-applications-on-iis/
At the Windows server where you want PHP installed: