Use XAMPP to install PHP and apache. It will also include MySQL and phpMyAdmin (which you will need sooner or later) and some other good stuff too. It's much easier than trying to configure PHP and apache by hand. Best of all, it's all configured to run together immediately. XAMPP and all of its components are free and open source.
http://www.apachefriends.org/en/xampp.html

Once you've got a web server, you need to turn it on (that's not automatic.) There's a nice control panel that makes this easy with XAMPP. PHP files will only work if they're in a specific subdirectory (usually htdocs in the apache directory structure) Also, you can't just load a PHP file into the browser the same way you do an HTML file. Instead, you need to point the browser to
http://localhost/yourFileName.php

PHP is called by the server, so if you use a mechanism (like the file:// directive) that bypasses the server, your PHP programs won't run.

Best Site to Learn PHP http://www.w3schools.com/php/default.asp

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IIS is an option, however, under a "Default" installation of XP Pro, it might not be installed

Control panel – > add / remove programs -> Add Remove Windows COmponents – Check "Internet Information Services"

You could also look @ apache as has been mentioned, however, IIS is PART of windows.

:O

:O

how is this not a real photo?

If you are ready invest: Get Larry Ullman: 'PHP …" Nice book