You could try this software it sounds pretty good although I have not used it so I am unable to direct you on how but it reads as though it has a password reset tool as well as windows password cleaner and a blank the password utility on any user that has a valid account on windows system and many other tools you might find helpfulhttp://majorgeeks.com/Dr._Freeware_System_Utilities_d6416.html
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You could try this software it sounds pretty good although I have not used it so I am unable to direct you on how but it reads as though it has a password reset tool as well as windows password cleaner and a blank the password utility on any user that has a valid account on windows system and many other tools you might find helpful http://majorgeeks.com/Dr._Freeware_System_Utilities_d6416.html