Windows and PHP
Can PHP be used on Windows?
Short Answer: Yes, it certainly can.
Long Answer: Yes, PHP is designed to run on virtually any operating system that can run a web server. On Windows you can choose to either run PHP with IIS, or install Apache (and run PHP with it).
My suggestion is to run PHP with IIS, as this allows you to run PHP and ASP/ASP.NET at the same time, giving you even more power.
To install PHP on your server, go to the PHP website, and download the appropriate binary for Windows.