Admin login lost user name pw HELP!!

I created user accounts and myself as admin. I disabled
fast access so that no one could see the userlist since
user accounts did not need passwords only their username
to login. My admin account is the only one password
protected. I know the password is correct but it will not
work for either "Administrator" or "W.Hindman" which I
believed the latter to be my username.

User accounts still work and login properly. How can I
either retrieve the admin login (username) information or
totally disable the login screen?