Remove Admin Password Windows NT/XP/VISTA
Using Linux Distribution Trinity Rescue Kit 3.2 - download

 

Windows XP -type winpass -u Administrator at the command prompt.

To reset a Windows Administrator account called Admin, just replace Administrator with Admin.

The winpass command will then displaying message that resemble these:

Searching and mounting all file system on local machine
Windows NT/2K/XP installation(s) found in:
1: /hda1/Windows
 

Type 1 and press ENTER

Next, its time to reset password of the specified Windows account. The Trinity Rescue Kit suggests resetting it to a blank password that might work better than setting a new password!

So, just type * (asterisk key) and hit the ENTER key to reset a blank or empty password for the specified Windows account.

Then, type Y and press ENTER

Now, type init 0 to shutdown the Trinity Rescue Kit Linux system.

Windows should automatically log on with an Administrator account without asking for a password.