If you are running WinXP, you go to the control panel 'Users'. Make sure there is no password and only one user. Then make sure the 'Welcome' screen is on. Once that is done it should go in without a login.
In Windows 2000. Go to 'Users and Passwords'. Uncheck 'Users must enter a user name and password to use this computer'. I think there is something like that in WinXP as well. I'm using Win2k myself.
2014 is going to be a good year. More content, more streamlining. Be a part of history!