Subject 'PDOException' Operating system directive OpenProcess failed
Hello, I would greatly appreciate if I could lend a hand:

My server is IIS 7.5 on Windows (64 bit)

Eventually I get this message from PHP:
"PHP Fatal error:  Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [335544373] operating system directive OpenProcess failed''"

Pressing F5 or navigating to another page (entire site using PHP 5.4.x takes php_pdo_firebird.dll connection) until the error disappears reappears for no apparent reason.

The database and directory exist and all users have full permissions on the directory.

Is there any known incompatibility with Windows 64-bit systems?

How I can fix this error?

Thank you. A greeting.