Cannot get install.php to work – claims no MySQL

Windows 2000 server here in the office. Installed PHP and http://localhost/test.php gives me the standard phpinfo() output in a browser.
Just installed mySQL 5.0 and created a new DB called wpress in a command window. “show databases;” displays 4, including wpress.
wp-config.php looks like:
// ** MySQL settings ** //
define(‘DB_NAME’, ‘wpress’); // The name of the database
define(‘DB_USER’, ‘root’); // Your MySQL username
define(‘DB_PASSWORD’, ‘MRoot4Me’); // …and password
define(‘DB_HOST’, ‘localhost’); // 99% chance you won’t need to change this value

The browser displays: Your PHP installation appears to be missing the MySQL which is required for WordPress, when I run the install.php file.

What did I do wrong?

All help appreciated.