Can't change Windows 7 password [duplicate]

Possible Duplicate:
I can’t change any system files from cmd

I forgot the Windows 7 password on my own computer, I used the trick described in Resetting Your Forgotten Windows Password:

Boot from the Windows 7 repair ISO.

Execute:

copy c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe

Use the Sticky Keys feature of the log in screen (now the command prompt) to execute:
```
net user Admin MyNewPassword
```

I kept the file there in case I ever forgot it again.

A client of mine asked if I could do the same for him, and he also has a PC with Windows 7 Home x86.

I followed the same steps as on my computer. The command of step 2 says it was successful, but when press Shift five times to trigger Sticky Keys, the regular message for sethc.exe opens up.

I tried entering the command of step 3 directly from the repair ISO. This claimed to be successful as well, but the password was not changed!

What I'm doing wrong?

I would not recommend you to reset your password by this method, this is actually a method that cracker used to grant administrative rights. This is a vulnerability of windows that allow user to use a CMD with administrative rights before login.

If you forget to recover your sethc.exe with the original one, you are leaving a backdoor for everyone to access your computer with administrative rights without login. (If you can reset your password, everyone can do the same.)

If you want to reset your password, I would recommend you to use Offline Windows Password & Registry Editor or PC Login Now v2.0.Both of them are bootdisks, which you can burn to CD or install on a USB drive.

Offline Windows Password & Registry Editor is completely text based while PC Login Now v2.0 have a graphcal interface, which may be easier to use.

For more information, you can visit: