When enable php_pdo_mysql.dll pages stop working

I'm trying enable PDO on my server, because CakePHP 2.1 need it, but
when I'm uncomment in php.ini php_pdo_mysql.dll all pages working with
MySQL stop working. When I re-comment this dll pages start working
again. Could you give me some advice what to do? I have Windows 7.
Apache 2.4, PHP 5.4, MySQL 5.5.21.

I only got error message from my browser Error 101 (net::ERR_CONNECTION_RESET):

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Pozdrawiam
Dominik Gajewski

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