This is a very fundamental question but I'm using a reconditioned desktop and was trying to change my username but got mixed up with what to do and now I can't log on directly I unchecked log on with log on screen I think it said and now I am asked for a password but when I entered without one the computer came on. How should it be set just to come on if there's only one user? In user settings it gives one name which is owner, then says guest account turned off but because I was messing about there's a separate log on comes up and I can switch users but I don't want to do this what do I do? Sorry: even to me this sounds confusing! Mandy.