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Change Other User’s Passwords in Command Prompt in Windows Vista
Instead of clicking "Start" button, then click on "Control Panel", then click on "User Account", click on "Manage other accounts", and finally click on a user account to change his or her password, you have a simpler way to change other user's password.
Simple open a command prompt and type in the following command:
net use "User name" *
And hit enter, type in the new password and hit enter. Enter the same password for the second time and hit enter. That's all you need to do to change other user's password. How simple is it?
* Please note that you must have administrative right to change other user's password.