You can create a Password Reset Disk!

If you’re running Windows XP Professional as a local user in a workgroup environment, you can create a password reset disk to log onto your computer when you forget your password. To create the password reset disk:

1.Click Start, click Control Panel, and then click User Accounts.
2.Click your account name.
3.Under Related Tasks, click Prevent a forgotten password.
4.Follow the directions in the Forgotten Password Wizard to create a password reset disk.
5.Store the disk in a secure location, because anyone using it can access your local user account.