Cannot access phpmyadmin after WP installation

I have a local server environment set up through Wampserver. After I installed a copy of WordPress in my local environment, it no longer lets me access phpmyadmin.

This is the error I get when visiting http://localhost/phpmyadmin

Error

MySQL said: Documentation
#1045 – Access denied for user ‘root’@’localhost’ (using password: NO)
phpMyAdmin tried to connect to the MySQL server, and the server rejected the connection. You should check the host, username and password in your configuration and make sure that they correspond to the information given by the administrator of the MySQL server.

It worked perfectly fine before installation (obviously, since I had to create the database :P) and my WordPress DOES work so the database is fine, but I can’t directly access phpmyadmin.

Any thoughts on how to fix it?