To reset your Windows password is very easy, as easy as resetting your Ubuntu password. What you need is bootable Ubuntu system (ie. USB, CD or anything) and software called chntpw.
This is step-by-step to reset your Windows password:
- Boot from your bootable device (Ubuntu Live Session)
Shutdown your computer and boot up using your bootable system. So you run Ubuntu on Live Session that means you run your system without install it!
Goto Synaptic Package Manager -> Settings -> Repositories -> Ubuntu Software and check the “Software restricted by copyright or legal issues
” checkbox. And don’t forget to reload synaptic.
Install from Synaptic Package Manager or use this command on shell:
sudo apt-get install chntpw
- Mount your “Windows installed” device
It’s depending on your system, example:
sudo mkdir /media/WINDOWS sudo mount /dev/sda1 /media/WINDOWS
On my system Windows installed on /dev/sda1 and I want to mount it to /media/WINDOWS that I’ve created before.
Located at [WINDOWS_DEVICE]/WINDOWS/system32/config/:
cd /media/WINDOWS/WINDOWS/system32/config/
There a SAM file on Windows system
configuration folder. That’s the file we’re looking for. Let’s crack it 
chntpw SAM
And if you see the output similar with image below, it’s mean you can crack the SAM file.
As you see, there is 5 choices. Just type “1″ and press “ENTER” to reset your password.
Note: I’ve try this on my system and work well! But I’ve never try another choices (2-4) yet, you can try yourself.
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