For Windows OS, Ophcrack is the tool of choice. It is a free Windows
Password cracker based on Rainbow Tables. It has a GUI which makes it
easier to run. The software can decipher passwords up to 14 characters
in length in a quick 10 seconds.
Ophcrack uses rainbow tables to guess the password. When a working one
is encountered, it is presented to you, and you can simply log in with
it.
One would think this “guessing” takes a lot of time, but that’s just where the power of rainbow tables lies.
One would think this “guessing” takes a lot of time, but that’s just where the power of rainbow tables lies.

1.To use Ophcrack one needs to download the Ophcrack ISO (Live CD) and burn it to a CD (or load it via a USB drive).
2.Run the Live CD by loading it in the tray and restarting the computer with the power switch.
3.Switch to the BIOS options and set the computer to boot from the CD Drive.
4.The computer boots up and reads the Ophcrack CD which then proceeds to break the password.
5.Use this password to log into the machine.
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