Run PHP applications on IIS Server
Using FastCGI to Host PHP Applications on IIS
Make sure you get the FastCGI extension for IIS 6.0 or IIS 7.0. It is the single most important thing you can have when running PHP under IIS.
You can download the FastCGI extension for 32-bit and 64-bit Windows XP and Windows Server 2003 here:
Refer below article should get you setup.
This article explains how to use the Microsoft IIS FastCGI extension to set up and run PHP applications on Windows XP and Windows Server® 2003 operating systems.