Win7 Home, preconfigured PC first startup: no username used durning setup?

Using a dime a dozen, store bought preconfigured PC running Win 7, during the initial setup out of the box, when you are at the user name/ computer name screen, I initially typed in a user name, but then did a "cut", deleting that name and I just entered a password to see if it would let me do this.

To my surprise it did, advancing me to the next screen with just a password.

When I got to the actual login screen and just typed in the password, but it wouldn't let me login. I tried the original user name with the password, but that didn't work.

The solution from Comtrash was to do a restore process, effectively reloading their version of the O/S.

Is this some M$ glitch?