Did you try clicking in the password field and pressing Enter/Return? Thus entering the same password as the computer guy who set it up?
Take a look in the system preferences and see what account name you have in there. If your account is there, and it surely must be, then the Installer CD with the Reset Password option should show every account on the machine.
You can safely reset ALL the passwords on the system, including root, with the utility.
If all else fails, you can always start again, only this time, do it your self.
I have a new Imac 20" G5 that I ordered through the university where I work. It was delivered to our departmental computer guy who started it up, updated it, and installed the academic licensed version of Office 2004. He inserted my name as user but didn't enter a password. I took the unit home and set it up (pretty easy for a terminally clueless person like myself).When I tried to install the university supported Eudora program via download, I was asked for my user name and password. When I opened the Accounts pane, it would only let me change my password which required a password. When I used the install disc to establish a password, it only showed the root user as an option, something I guess I shouldn't get involved with. I know I'm missing something simple. Does anyone know what it is? Thanks, Jay