Chntpw for Dos

From CGSecurity

NTFS driver & Change a NT password from MSDOS (March 25, 2002)
You can access in read/write mode to your NTFS partition files from MSDOS and you can change NT administrator password.
It works for NT 3.5 and NT 4. Support for >8Gb hard disk.

• Download zip tgz
• Original source of NTFS driver (GNU General Public License)
• Original source of chntpw

Example to copy a file from a NTFS partition, change a password and modify it on the NTFS partition:

a:> ntcp ///winnt/system32/config/sam sam
a:> chntpw -i sam
a:> ntchange sam ///winnt/system32/config/sam

Use this bootdisk if you have W2K or XP!
You can also try Ophcrack. It's a Windows password (Vista supported) cracker based on rainbow tables.
To reset the Domain Admin Password under Windows 2003 Server, try this page.