So, I was about to update iPhoto and usually I simply insert my password and not the username (the username is already in the bar, so I simply type my password and things start to downl) But for some reason my Admin name was not there, and when I typed it in with my password, it didn't work. I tried changing my password un the Account settings and still no luck, I also tried to insert the startup disk and hold the C button, but for some reason when I access utilities and then reset password thing on the startup menu, my account does not appear, only the default account, so I can't reset the password that way. I tried restarting my computer but still no luck with the old settings that I had yesterday in my Admin Username and Password. Help Me!!
EDIT: Nevermind, I found the cure.
EDIT: Nevermind, I found the cure.