How to install PHP5 on Windows 2003 and IIS6

There is no shortage of tutorials on the net that show you how to install PHP on Windows with IIS, but since it is a base requirement for so many other things we plan on writing tutorials for, we decided to do a PHP only tutorial for Windows 2003 and IIS. In this tutorial, we start with a fresh Windows 2003 Standard server with Internet Information Server (IIS) already up and running. We download PHP5, install it manually and configure IIS to serve PHP pages. We don't get into any special editing of the PHP.INI file, but that will be covered in other, more specific tutorials on this site.