follow these steps:
1.Boot from Windows PE or Windows RE and access the command prompt.
2.Find the drive letter of the partition where Windows is installed.
In Vista and Windows XP, it is usually C:, in Windows 7, it is D:
in most cases because the first partition contains Startup Repair.
To find the drive letter, type C: (or D:, respectively) and search
for the Windows folder.
NOTE: that Windows PE (RE) usually resides on X:.
3.Type the following command (replace “c:” with the correct drive letter
if Windows is not located on C:):
4.copy c:\windows\system32\sethc.exe c:\
5.This creates a copy of sethc.exe to restore later.
6.Type this command to replace sethc.exe with cmd.exe:
7.copy /y c:\windows\system32\cmd.exe c:\windows\system32\sethc.exe
8.Reboot your computer and start the Windows installation where you
forgot the administrator password.
9.After you see the logon screen, press the SHIFT key five times.
10.You should see a command prompt where you can enter the following
command to reset the Windows password :
"net user your_user_name new_password" -type it without ""
12.If you don’t know your user name, just type net user to list the
available user names.
13.You can now log on with the new password.
I recommend that you replace sethc.exe with the copy you stored in the
root folder of your system drive in step 3. For this, you have to boot
up again with Windows PE or RE because you can’t replace system files
while the Windows installation is online. Then you have to enter this
command:
copy /y c:\sethc.exe c:\windows\system32\sethc.exe
NOTE:If you got any problem in following this guide feel free to ask questions by leaving a comment.
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