Go to Start, Run and type in "control userpasswords2" and hit enter. Then clik on the name of the user you want to login and uncheck the User must enter password check box. It will ask you for the login of said user (if there is none than leave it blank). Clik ok and your good to go. I think you need to turn off fast user switching for this to work but maybe this does it for you I'm not sure. Cheers.