PDO on Win2000Server

Hi I'm having trouble getting PDO to work on Windows 2000 Server with PHP 5.1.2. I've enabled the extensions in php.ini, which was all I thought I had to do. Is there anything else? I thought PDO would show up in phpinfo(), but it doesn't. In my code, when I call: new PDO(...); I get an error: Fatal error: Class 'PDO' not found in C:\...\pdo_query.php on line 15 This is whats recorded in my errors log: [15-Apr-2006 10:38:15] PHP Warning: PHP Startup: Unable to load dynamic library 'C:\php\ext\php_pdo.dll' - %1 is not a valid Win32 application. in Unknown on line 0 [15-Apr-2006 10:38:15] PHP Warning: PHP Startup: Unable to load dynamic library 'C:\php\ext\php_pdo_firebird.dll' - The specified module could not be found. in Unknown on line 0 Do you have any suggestions that could help me out? Thanks S.