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I tried resetting the password of windows 7 Using chntpw command in Ubuntu . It showed success. But when I try to login from Windows it does not seem to be changed.

I first used live USB of Ubuntu 11.10 and did Try Ubuntu. Then I did:

sudo apt-get install chntpw

And then:

cd /media/Vista/Windows/System32/config
sudo chntpw -u username sam

I followed these instructions and got success like this:

Hives that have changed:
# Name
0 <sam>
Write hive files? (y/n) [n] : y
0 <sam> – OK .

But when I try to login to windows with blank password, I could not log in.

I also tried changing the password and showed success but I could not log in with that password.

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possible duplicate of Usage of chntpw –  hbdgaf Jul 11 '12 at 7:19
    
Rather use Offline registry editor. –  Misery Apr 9 '13 at 11:18

6 Answers 6

You can login as admin, and click start->Control Panel->User account to change Windows 7 password, if this doesn't work, you can follow this guide: How to reset Windows 7 password

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I am using Ubuntu 12 and chntpw 0.99.5. I have successfully reset my forgotten password by following this guide. If there are multiply Windows systems installed on your hard drive, make sure you choose the desired SAM database.

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Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. –  David Edwards Apr 9 at 15:41
    
There is no problem with the steps that Sandesh did. Only the version of chntpw will make difference. chntpw 0.99.5 works from my side. –  user267077 Apr 10 at 6:22
    
Then it sounds like your answer is a duplicate of the top-voted answer already here. –  David Edwards Apr 10 at 10:45

I had the same problem. What worked for me was using chntpw to unlock the administrator account, which was the only function of chntpw that worked. Then I booted windows, logged in as Administrator, and cleared the users' password with the users app in control panel.

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The 0.99.6 version of chntpw is totally disfunctional: https://bugs.launchpad.net/ubuntu/+source/chntpw/+bug/1046622

I struggled more than a hour to find this out.

Try to use 0.99.5 instead, it works for me:

https://launchpad.net/ubuntu/karmic/i386/chntpw/0.99.5-0+nmu1

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The new version of chntpw doesn't work with windows 7. You have to go back a version.

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2  
Can you specify the versions you are talking about? –  belacqua Jun 15 '13 at 0:40

To change Administrator password: sudo chntpw SAM. To change another users password: sudo chntpw -u <your-username> SAM Please note the Upper-case of the word SAM

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When I tried using upper-case it showed some errors regarding the heive . So I used lowercase . I tried using both sudo chntpw sam and sudo chntpw -u username sam . It shows success also . But when I log in to windows it says incorrect password . Thank you . –  Sandesh Yadav Jul 11 '12 at 7:53
    
How do you type your username if it contains accented letters? It's impossible. –  Calmarius Oct 2 '13 at 20:38

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