Mac starts up as administrator I just got a new Mac Air for my wife. Every time she starts it up (after installing software, crashes, whatever), it starts up logged in as administrator. This confuses my wife no end (where did all my stuff go?)

How can I make it just go to the login screen?
You can disable automiatic login by going into System Preferences, Accounts, then selecting "Login Options" and changing "Automatic login" to "Off":