Well, I moved php.ini to the windows folder, put my extension's folder location in file and uncommented extension=php_mysqli.dll and when I try to install MediaWiki (a PHP script that uses MySQL), I get the error [quote] PHP 5.1.4 installed Could not find a suitable database driver! For MySQL, compile PHP using --with-mysql, or install the mysql.so module [/quote] PHP seems to be working fine with Apache, and MySQL works on its own. I downloaded PHP from the zip file. The only thing I can think of is that my php5apache2.dll file is messing things up because I downloaded the file from [url=http://www.apachelounge.com/download/]here[/url] because the one that comes with PHP/Apache didn't work, and I kept getting [url=http://www.phpfreaks.com/forums/index.php/topic,103091.0.html]this[/url] error. I am running PHP 5.1.4, Apache 2.2.3, and MySQL 5 on Windows XP.