When you are using Windows XP, every time when it boot up, it will ask you to enter the username and password.

If you want to skip this step, you can
go to Start
Run
and type
control userpasswords2
and click ok

a "user accounts" menu comes up

all you have to do is uncheck the box
"users must enter a username and password to use this computer"
and click OK to exit

哈哈！溫故知新...

ok, got it, ty

Good and thanks