On a WinXP machine I've installed MySQL 4.1 successfully and I followed the manual steps for installing PHP 4.3.9. When I "open with" IE a test.php file nothing happens - no IE window, no extra process, nada. Same thing if I start an IE window and then use its address to attempt to open the file - nada is shown, just the same directory contents. Here's the file contents: <?php phpinfo(); ?> Is this a PHP or an IIS 5.0 problem? I've never tested whether my IIS is running properly.