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Ophcrack is an open source (GPL license) program that cracks Windows LM hashes using rainbow tables. It can crack 99.9% of alphanumeric passwords of up to 14 characters in usually a few seconds, and at most a few minutes. There is also a LiveCD version which automates the retrieval, decryption, and cracking of passwords from a Windows system.
http://ophcrack.sourceforge.net/
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