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I just installed Windows 7/64 (dual boot) on an older system. Then I set up autologin...incorrectly.

If I boot into the the old Windows 7, I can access the file system of the new install (I think).

Is there, then, a way to find out the password?

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4 Answers 4

No, the passwords in Windows are sent throught a one-way encryption and then stored in the encrypted form, so that they can not be read-out by an attacker.

You can, however, reset your password to blank with a software like "Offline NT Passwort & Registry Editor", which is part of the "Ultimate Boot CD", that provides a great choice of system recovery tools.

Here's the link: http://www.ultimatebootcd.com/
Or only ONTPRE: http://pogostick.net/~pnh/ntpasswd/

Warning: These tools require a lot of caution, since you are meddling with the windows internals.

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Note that if you are using NTFS file encryption you will no longer be able to open any of your encrypted files unless you made a backup of the certificates before you reset the password. –  Scott Chamberlain Aug 2 '13 at 6:35

Try Ophcrack (it's pretty much self-explanatory, download the iso and boot from it).

If you're not able to retrieve your password with ophcrack, you still can use this flaw in windows: How to secure Windows 8 against utilman.exe exploit

Also, if you're able to access the files from the other windows-setup, i'd recommend backing up these data first.

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Several people answered your question already. There's several ways to recover a lost windows password:

Using ophcrack live cd. You download it, burn it and boot your pc with it. After while (sometimes long) it will return a list of users and their passwords. On windows7 it doesn't always crack all the passwords.

The plus side is you don't need to change your password, you actually find out what it is you forgot.

Another option is to use one of the several windows recovery tools available:

  • Ultimate Boot CD: Has a command named "Offline NT Password & Registry Editor 110511" which allows you to set a new password for your account. Use with care.
  • BartPE: Has a program named "Password renew" which works similar to UBCD's

Another option I think no one mentioned, is a quick hack you can do from any linux live cd or windows recovery console:

  • Copy C:\Windows\System32\sethc.exe to another location (C:\ is just fine)
  • Copy C:\Windows\System32\cmd.exe to C:\Windows\System32\sethc.exe
  • Reboot your computer and press Shift 5 times on the windows login screen. A command line window will pop up
  • Change your password with net user <username> password yournewpassword
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konboot - that'll let you login without a password

http://www.piotrbania.com/all/kon-boot/

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. –  Al E. Jul 10 '13 at 12:53

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