1) Start, Run and enter CONTROL USERPASSWORDS2
2) Check the box, Users must enter a username...........
3) Highlight the user you want automatically logged on.
4) Uncheck the box, Users must.............
5) Click Apply
6) In the next dialog, enter the password for the account you chose in step 3
7) OK your way out.
Often the account that is selected/highlighted when you first run USERPASSWORDS2 is the Administrator account. If it has a blank password, that is the account you'll be logged into.