Got the exact same problem here with WampServer 2.0i, Apache 2.2.11 and PHP 5.2.6 to 5.3.0 (including 5.2.9-1 and 5.2.9-2).
PHP 5.2.5 and PHP 6.0 dev (12/02/2007 Snapshot) seems to work fine so far.
php_pdo, php_pdo_mysql and php_pdo_sqlite will load and work just fine.
php_pdo_pgsql, php_pgsql and php_pdo_oci won't load for some obscure reason.
Prior to PHP 5.2.9-2, Apache/PHP is s
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