1. Install Internet Information Services (IIS) by selecting Start, Control Panel, Programs, Turn Windows features on or off. Click the plus sign (+) to expand `Internet Information Services`, `World Wide Web Services` and `Application Development Features`. Under `Application Development Features`, make sure `NET Extensibility`, `ASP.NET`, `CGI, ISAPI Extensions`, `ISAPI Filters` and `Server-Side Includes` are selected. Download PHP compressed files. Note that Non-thread-safe build of PHP is recommended when using IIS.