After install MySQL Administrator GUI tool, it is possible that you run into the error like the following when you login into the tool.
The solution is simple. Try login to the server without the login and password.
Remove the username and password and press control key. The "Cancel" button turns into a "Skip" button.
Press Skip and it will take you to the interface that you can manage and make correction to the config file. In most of the case, the default ini file is pointing to my.cnf. Change it to my.ini.