Check the below script that will change your local Administrators passwords to the one you specify. (Note that you'll need to encrypt this one using Microsoft script encrypter if your users shouldn't be able to read it in clear text.)
Code:
Set WshNetwork = WScript.CreateObject("WScript.Network")
strComputer = "."
Set objUser = GetObject("WinNT://" & strComputer & "/Administrator,user")
objUser.SetPassword "NEW.PASSWORD" ' Enter new password between brackets
objUser.SetInfo
Some more information here - http://support.microsoft.com/kb/198642
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