"How-To" Tutorials: How to enable automatic logon on Windows XP
You can enable automatic logon using this method as long as you have not joined a Windows server domain.
START / RUN / control userpasswords2
Uncheck the checkbox to require users to login
After you click OK, it will ask which user you want to use to auto-logon, and allow you to type in the password if one is set.
Viewed: 24993 as of 08/18/2017