the localhost login, all you do is type in the username you set up while installing, probably your first name or something, press enter then type the password, that should do it. sounds like you are booting to a command prompt, so after logging in just type startx and press enter. your graphical desktop will open
if you don't have a standard user account set up, then simply type in "root" (without "") for the username then press enter and type your root password. when you startx, in the settings menu look for something that indicates configuration or similar then you can add a standard user account from there.
hope that fixes your problem mate