An interesting question has come up in the 404 Tech Support forums that I have answered to the best of my abilities. It expands on several topics that I’ve discussed before such as using Kon-Boot to get logged into the machine (or other means), viewing saved passwords in browsers, and circumventing some security measures by using the target hard drive as a secondary hard drive in a second system. Having a legitimate reason, I hope this information is useful to Ajay, who originally asked this question.
I post this to attract your attention to the information, if you also need to get into a Windows 7 system without the password, and so that others might answer with anything I forgot or any other suggestions to assist Ajay.