You can recover passwords by downloading

OPHCRACK
http://sourceforge.net/project/showfiles.php?g roup_id=133599

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.

If you have more questions feel free to email me at ...