Click Start, Run and type "control userpasswords2", and click Ok.
ENABLE "Users must enter a user name and password to use this computer" option, and click Ok.
--
Ramesh - Microsoft MVP
http://www.mvps.org/sramesh2k
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.. Go to the Start Menu and the Run box.
.. Type in the following:
control userpasswords2
.. now click OK
.. In the new Windows that appears select the account you wish to make the
primary logon.
.. Now uncheck the "Users must enter a username and password..." box.
.. Hit Apply and a dialog box will appear asking you to confirm the
selected users password.
Click OK.
The changes will work the next time you restart your computer.
http://support.microsoft.com/default.aspx?scid=kb;en-us;315231
How to Enable Automatic Logon in Windows