Error accessing the database connection

Hi all

I would like to install wordpress locally in m windows. I installed Wamp and extracted the latest wordpress to ‘www’ folder. Created database named wordpress in phpmyadmin. Configured the wp-config-sample file as follows:

Changed the user_db parameter as wordpress

user_name parameter as root

user_pw parameter as root.

Saved this fiile as wp-config.php

now when I tried to access http://localhost/wordpress/wp-admin/install.php it shows error as

“Error accessing the database connection’.

Please help!!!!