After using the Windows installer for Apache 2.2 and PHP 5.3.2, and installing PHP as an Apache module (not CGI), Apache would crash and fail to start. There were two problems with the configuration files for Apache and PHP.
First, make sure your Apache configuration file reads something similar to:
LoadModule php5_module "C:/Program Files/PHP/php5apache2_2.dll"
PHPIniDir "C:/Program Files/PHP/"
While other users have disabled some or all of the MySQL extensions to prevent all three from running at the same time, I have all of them enabled. However, I do not have PostgreSQL, so I needed to comment out loading the php_pgsql.dll in my php.ini file, as follows:
This stopped Apache from crashing and started successfully.