Can´t select data PDO with CI 2.2.1

This may be one stupid question... but do you have PDO installed?

Yes, or else i would get an error. I have run the exact same code in earlier (hacked) version of CI 2.0.0.

And here is an update. Can´t even run this code:

$query = $this->db->get('objects');

Nothing get´s back. I really don´t know what is wrong here.

my db config:
$active_group = 'admin';
$active_record = TRUE;

$db['admin']['hostname'] = 'sqlite:C:/work/projects/pio/res/pio_test.sqlite';
$db['admin']['username'] = '';
$db['admin']['password'] = '';
$db['admin']['database'] = '';
$db['admin']['dbdriver'] = 'pdo';
$db['admin']['dbprefix'] = '';
$db['admin']['pconnect'] = TRUE;
$db['admin']['db_debug'] = TRUE;
$db['admin']['cache_on'] = FALSE;
$db['admin']['cachedir'] = '';
$db['admin']['char_set'] = 'utf8';
$db['admin']['dbcollat'] = 'utf8_general_ci';
$db['admin']['swap_pre'] = '';
$db['admin']['autoinit'] = TRUE;
$db['admin']['stricton'] = FALSE;