NT Password Cracks

The L0phtcrack Method (requires physical access or will listen for SMB on a non-switched network)

Will recover current passwords

1. Download lc252install.zip. 
2. Extract and install on your machine.
3. Download ntfsdosbootfloppy.
4. Extract to floppy.
5. Reboot target with floppy.
6. Run ntfsdos to mount NTFS drives.
7. Run getsam.bat that is on the floppy you just made..
8. On any NT machine booted to Windows run 'a:\expand sam sam._'
9. Start L0phtcrack.
10. Load sam._
11. Start Cracking.

The Linux Bootdisk Method (requires physical access to machine)

Allows you to change any password on local machine

1. Download linuxbootdiskcracker.ima.
2. Extract with winimage and blow on floppy.
3. Boot target machine with floppy.
4. Wait, answer a few questions.
5. Select desired account.
6. Change password.
7. Reboot target machine and enjoy.

UNIX/Linux Password Cracks

1. Download John the Ripper.
2. Follow instruction within.
3. Tedious and long but always worth it!