HOW TO: Create and Configure User Accounts in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;279783&sd=tech

Windows Home XP
1. As windows is loading up press F8 repeatedly until the Windows advanced
screen comes up.
2. Select safe mode (the version of windows you want to use click XP wait
until it loads the welcome screen.
3. Select Administrator and it will log you on as administrator without a
password (provided a password was not created in this hidden account during
setup).
4. Go to Start - Control Panel - User  Accounts.
5. Create the account.

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If you have XP Pro on your computer:-
1. At the log in screen " ctrl-alt-delete " twice.
2. In the User Account,  type Administrator
3. Leave the password blank and press enter.
(Most likely a password wasn't created in this hidden account during setup).
4. Go to Start - Control Panel - User  Accounts.
5. Create the Account.