free open source (GPL licensed) program that cracks Windows passwords by using LM hashes through rainbow tables. The program includes the ability to import the hashes from a variety of formats, including dumping directly from the SAM files of Windows. On most computers, ophcrack can crack most passwords within a few minutes. (wiki)
Wiki
https://en.wikipedia.org/wiki/Ophcrack
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Download
http://ophcrack.sourceforge.net/download.php
Tables
http://ophcrack.sourceforge.net/tables.php
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Sourceforge
http://ophcrack.sourceforge.net/