Asking about failure of accessing mySQL database by PHP-5.1.6 on Windows 2003

Hello Sir/ Madame, I am a developer working with PHP-5.1.6-Win32 and mySQL database. Following is my question: I successfully runs PHP-5.1.6-Win32 with Internet Information Services 6 (II6) on Windows 2003 under ISAPI mode. Then, I runs the index.php of phpMyAdmin software to connect to MySQL database, the result is "Cannot load mysql extension. Please check your PHP configuration". Conditions such as php_mysql.dll and supplying information for extension_dir in php.ini are supplied. Such a connection runs successfully on Windows XP but not on Windows 2003. Please answer me the problem on Windows 2003. Thank you! Best Regards, Phuong This email may contain material that is confidential, privileged and/or attorney work product for the sole use of the intended recipient. Any review, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies.