Use Ubuntu live CD to reset your windows password
Hey i found this really cool article on howtogeek[dot]com and thought to share with you people. This article elaborates how you can change your windows password by using a Ubuntu live CD.
All the windows password are stored in a file name SAM and its path isC:\Windows\System32\config( C: in my case ). All you are doin is editing this via ubuntu(as you can't do so in windows)
Click here to view the full article on howtogeek