Option 1:
Download and install TweakUI from the Powertoys for Windows XP
collection. In the Logon section,
set the
default username and password to be used.
As of
4/24/2002, the individual Powertoys for Windows® XP are
available
here.
Option 2:
Do the following
1) Click
Start, Run and enter CONTROL USERPASSWORDS2
2) In the list of users, highlight the user account you want
automatically logged on.
3) Uncheck Users must enter a Username and password
4) Click Apply.
5) In the next dialog, enter the password for the account you selected
in Step 2, if any
6) OK your way out.