Start | Run, type
CONTROL USERPASSWORDS2
and hit Enter.
User Accounts window will pop-up. Uncheck the "Users must enter a
username
and password to use this computer" checkbox, click OK button, and on
the next screen select your username and password (if you have none,
set the password first pressing Ctrl-Alt-Delete and clicking "Change
password" button). Click OK.
Notes: 1. Each Windows XP installation has Administrator account by
default. Do not delete this account!
2. It is strongly recommended to use strong (not less then 8
characters, including digits, upper- and lowercase letters and special
characters as @ $ + , .) Use User Accounts screen to set passwords.
Write down Administrator password and put it to the safe place - you
will need it to fix your Windows installation! Write down your working
account password also, DO NOT connect to the Internet from account
without password!