I had this same problem. During the install if you put in a password when MYSQL was installed, that is where the problem is. It is simple to fix simply edit the config.php file Sk00t3r spoke of and you will see the password field is labled as

Define (“MYSQL_PASSWORD”, “”),

enter in the password you entered during setup ie.

Define (“MYSQL_PASSWORD”, “your password here”),

Once I did this it came right up for me.