This is from an old reply of mine here dated from 2014.
This is the Microsoft information for when you forget your XP Password that they used to have online.
Microsoft has pulled the links due to support ending but the information will still be true.
"How to log on to your Windows XP-based computer if you forget your password or if your password expires"
http://support.microsoft.com/kb/321305
Windows XP Home Edition or Windows XP Professional Edition
To log on to a computer as the administrator to reset a password, try the following steps.
- Log on as an administrator.
- Restart the computer.
- Press CTRL+ALT+DELETE two times, and then type the name of the administrator user account.
Note If you do not know any other administrator user account, try to type Adminstrator in the User name box. 3. In the Password box, type the administrator password, and then click OK.
Note If you do not know the administrator password, leave it blank, and then click OK. 2. Reset the password.
1. Click **Start**, and then click **Run**.
2. Type control userpasswords2, and then click **OK**.
3. On the **Users** tab, click the name of the user account that you want to reset the password for, and then click **Reset Password**.
4. Type a new password in the **New password** box, and then type the password again in the **Confirm new password** box, and then click **OK**.
5. Restart the computer, and then try to log on to Windows XP again.
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Other than the above information, we can not assist you any further with this.
Microsoft forbids any assistance being given in these Forums to help you bypass or "crack" lost or forgotten Passwords.
Here is the Microsoft Information outlining that Policy: