Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
If there was no user name nor login on the computer before, then try entering default values... your name or your home directory name, for the user name, and then a blank (no characters) for the password.
In this case, the system *cannot* make up a password ***** you. It has to use default values. It will (in usual UNIX/Linux fashion) only have a blank password ***** this point.
The only real puzzle would be the user name. The exact spelling of your home directory on the system, as it was, would be a logical choice, however. Try that as a username to log in with, and see if that, and a blank password, works.
(Keep in mind that Linux tends to observe UPPER-CASE and lower-case distinctions in some instances, so spell the username exactly as your home directory name is spelled.)
Let me know how it goes, please.