Description:
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I could not use Prepared Statement in my program. Any query I use within $mysqli->prepare() returns a null variable. When I print the $mysqli->error it prints out "Unknown command"
I am pretty sure it is not the query string, because the same Query I use with the query() (without prepare) statement and it works fine.

I haven't changed my php.ini, except by uncommenting the line extension=php_mysql.dll and adding the line: 
extension=php_mysqli.dll

Please, Test it in the Windows 2000
I use Mysql 4.0.2


Reproduce code:
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$conn = new mysqli(HOST_MYSQL, USER_MYSQL, PASSWD_MYSQL, DBNAME_MYSQL);
	if (mysqli_connect_errno()) {
	    printf("Connect failed: %s\n", mysqli_connect_error());
	    exit();
	}
	$consulta = $conn->prepare("SELECT MD5_PASSWORD FROM tb_user WHERE TXT_LOGIN=?" );
 	if (!$consulta) 
 		printf($conn->error);
        $consulta->bind_param("s", $_POST["password"]);
	$result = $consulta->fetch();


Expected result:
----------------
Unknown command
Fatal error: Call to a member function fetch() on a non-object in C:mydir on line 17