How can I restore/break the windows password??

I've a windows xp box. Now I don't have any access to that box since I have forgotten the password. How can I restore/break the windows password??

Use a password reset disk Windows XP Home Edition or Windows XP Professional
1. Restart the computer.
2. On the Windows XP logon screen, click the user
name that you want to use, and then press ENTER.
*Note* You receive the following error message: Did you forget your
password? You can click the "?" button to see your password hint. Or you can
use your password reset disk. Please type your password again. Be sure to
use the correct uppercase and lowercase letters.
3. Click *Use your password reset disk*.
4. In the *Password Reset Wizard* dialog box, click *Next*.
5. Insert the password reset disc into the CD drive, and then click *Next*.
6. Type a new password in the *Type a new password* box, and then type the password again in the *Type the password again to confirm* box.
7. In the *Type a new password hint* box, type a hint for the password, and then
click *Next*.
8. Click *Finish*, and then try to log on to Windows XP again.