Hello, i juet read this article and i foudn it very interesting Code: Forgetting your password is never any fun, but luckily there’s a really easy way to reset the password. All you need is a copy of the Windows installation disk and one simple command line trick. Resetting Your Forgotten Windows Password Boot off the Windows disk and select the “Repair your computer” option from the lower left-hand corner. Follow through until you get to the option to open the Command Prompt, which you’ll want to select. First you’ll want to type in the following command to backup the original sticky keys file:copy c:\windows\system32\sethc.exe c:\ Then you’ll copy the command prompt executable (cmd.exe) over top of the sticky keys executable:copy c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe Now you can reboot the PC. Resetting the Password Once you get to the login screen, hit the Shift key 5 times, and you’ll see an administrator mode command prompt. Now to reset the password—just type the following command, replacing the username and password with the combination you want:net user geek MyNewPassword That’s all there is to it. Now you can login. Of course, you’ll probably want to put the original sethc.exe file back, which you can do by rebooting into the installation CD, opening the command prompt, and copying the c:\sethc.exe file back to c:\windows\system32\sethc.exe. but in Windows 8 Pro even though you can open a system level command prompt as described you can change the password of the user you want in order to login because it gives an eroor that it cannot complete this actions. here is the message: C:\Windows\system32>net user Νάγια nikos There was a system error 8646.The system is not a system of authentication for the specified account k century therefore can not complete the operation. Try to repeat function using the service provider associated with this Member of -accounts. If it is a web service provider, use the site lation of the service provider. So how can you still access that account?