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Use the Command Line to Change a User Password.
Forgot the password for a local user account and can't access it? Change it without knowing what the old password was:

Click Start | Run and type cmd to open a command prompt window.
At the prompt, type net users. This will show a list of the local user accounts created on the computer.
Pick the account for which you want to change the password. Type net user *. Put a space between the account name and the asterisk.
You'll be prompted to type a new password for the user. Type it in. Then you'll be asked to confirm the password. Type it again.
You should receive a message that the command completed successfully. Now you can use the new password to log onto the account.
This works with all editions of XP, but only for local accounts (not domain accounts).