Ophcrack is a Windows password cracker based on a time-memory trade-off using rainbow tables. This is a new variant of Hellman’s original trade-off, with better performance. It recovers 99.9% of alphanumeric passwords in seconds.

You can download a .iso file that contains a live cd. In case you forgot your password you boot from the live cd and try to recover the password using the live cd.
[tags]windows, password recovery, lost password, freeware[/tags]
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great program. used it to recover a pw from win2k server i bought on ebay. works great!
Windows password is not safe at all. Many password tool can recover windows password quickly and easily, such as Offline NT Password and Windows Password Rescuer.
Offline NT Password : http://home.eunet.no/pnordahl/ntpasswd/
Windows Password Rescuer: http://www.daossoft.com/products/windows-password-product.html
anyone need help, can contact me.
I cant believe you PURCHASED open source software
good tool