when you forget your admin login details, all you have to do is run the following statement in your phpmyadmin

UPDATE administrators SET user_password = 'fb7ad59c965ae1687e4d5b6079884010:3c';
UPDATE administrators SET user_name = 'admin';


it will reset your user name to admin
and reset your password to admin



Once you logged in you can change your user name and password

Easiest way to reset your admin details.

Good luck
Use on your own risk.
I tried on rc2 and worked perfectly



More...