How to Recover Windows 7 password in ubuntu?

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(1)First boot from Ubuntu O.S from live cd.

(2)Open Ubuntu Software Center . Search for CHNTPW . Install package. If you donot have internet  connection on password lost pc then download from  here.

(3)now open terminal. & type following command    

 cd /media/"drive name of windows 7 partion"/Windows /System32/config

please use your drive name of partion in which windows 7 is installed without quote.

(4)now type  sudo chntpw SAM . AND press ENTER. NOW press 1. & restart pc.