This article kinda old, but still lots of people need it.
Ok you have windows, but somehow you forgot the password. How to retrieve it, soo?
Here are 5 of these free tools:
1.Windows Password recovery (http://www.loginrecovery.com/)
Can retrieve forgotten admin and users’ passwords in minutes. Safest possible option,
does not write anything to hard drive.
2.Petter Nordahl-Hagen’s Offline NT Password & Registry Editor
A great boot CD/Floppy that can reset the local administrator’s password.
3.Openwall’s John the Ripper (http://www.openwall.com/john/)
Good boot floppy with cracking capabilities.
4.EBCD – Emergency Boot CD (http://ebcd.pcministry.com/)
Bootable CD, intended for system recovery in the case of software or hardware faults.