On the CorePHP blog today, there's a new how-to posted dealing with the installation and configuration of a Windows XP system running Apache 2, PHP4 and PHP5.
I'm very happy to announce that I've just released my comprehensive guide to installing, configuring and running Apache 2, PHP 4.4.7 and PHP 5.2.2 on Windows XP. The guide is broken down into small manageable sections and contains over 50 screen shots of the entire process, so you won't go wrong while following it.
The guide helps you set up a Windows XP machine with all of the needed software, including the setup of a virtual host to make switching back and forth between PHP4 and PHP5 simple.