Hi Have you ever used Windows Password Reset Software? I want to sale these kind of software it's usable?
Yes, I have. Last time I bought a second-hand pc. When I open it but it ask me password to login. Of course I didn't know. So to unlock the pc I searched many ways and compared them. But at last I focused on Anmosoft Windows Password Reset, which only 5 minutes to unlock and you can learn more from: http://www.resetwindowspassword.com
Windows passwords are a joke, and adds no security whatsoever. Most of the various password reset softwares put there uses a Linux boot cd or similar, and they work quite well. However, if you know what you are doing, you can do this manually via a console from any Linux distro.