If you can't set auto login on windows xp:
click start, run and type control userpasswords2
uncheck the "users must enter a username and password to use this computer"
click apply
enter the user name and password you wish to automatically log on with
-------------------------------------------------------------------------------------------------------------------------------------------------
For basic changes: go to control panel users
For advanced changes and to set auto login: Go to Start/Run, and type 'control userpasswords2'.
-------------------------------------------------------------------------------------------------------------------------------------------------