To change Windows NT password locally, such as Windows NT Administrator password, follow the below listed steps carefully:
- Click on the <Start Menu> from the desktop’s taskbar
- Choose and click on <Control Panel> from the Start Menu
- Choose and click on <User Accounts> from the list of options in the Control Panel
- Choose the option <Change an Account>
- Select the user account for which you wish to change the password
- Select <Change the password> option
- It prompts you for the current password <Enter the current password>
- It prompts you for a new password <Enter the new password>
- It prompts you for a new password confirmation <Confirm the new password>

- Enter a word or a phrase to use as a password hint
These instructions only work if you know your current Windows NT Adminstrator password. If you have lost your Administrator password, please refer to How do I recover a lost Windows NT Administrator Password? article.

It support Windows NT password reset.
And can help you to remove Windows password in one second!
http://digg.com/security/Windows_Password_Reset_Windows_Password_recovery_software
If you don’t want to change the password:
1 > Get a program called Ophcrack(very large. 496Mb)
2 >> Download the liveCD (ISO)
3 >> Burn the ISO to a CD using an ISO burner
4 >> The Live CD’s come with the free rainbow tables, so you might need to download other tables (cost money)
4 >> Bootup from the CD
5 >> Crack the SAM and System file
Or try Windows password reset Standard that support Windows NT.