Microsoft Windows XP - Back Up Your Login Password To Avoid Losing It Altogether
Microsoft Windows XP's Forgotten Password Wizard allows you to create a password reset disk that you can use to recover your user account and personalized computer settings in the event you forget your login password.
The procedure to do so differs depending on whether your computer is on a domain or in a workgroup, and whether it's an administrator or limited account. For specific details on each procedure, search for the phrase password reset disk in the Help and Support Center. If you choose to create a password reset disk, make sure you keep it secure, as anyone with access to the disk can change the associated account's password.