Install PHP5 on IIS6 - Windows 2003 Server

* Download the PHP5 Zip Package here
* Extract it to C:\PHP
* Add C:\PHP to your PATH Variable
* Open IIS Configuration Panel, WebService Extensions, add C:\PHP\PHP5ISAPI.DLL and set it to allowed
* Click down to Web Sites. Right click the folder and select Properties. From the Home Directory tab click the Configuration button. Click Add to add an Application Extension. Enter C:\PHP\PHP5ISAPI.DLL as Executable and PHP as Extension. Leave the rest as default and click Ok.