Database Error

I installed xampp in d drive.When i load the database I got a  error "Fatal error: Call to undefined function mysqli_init() in D:\xampp\htdocs\ci\system\database\drivers\mysqli\mysqli_driver.php on line 135".. But same folder working fine in another machine installed xampp in c drive.
Also in php.ini

Code:

extension=php_mysqli.dll

 is activated.Plz help how to solve

Have you updated the following configuration in config/database.php file

PHP Code:

$db['default']['dbdriver'] = "mysqli"; 


PHP Guru | PravinS