To do this turn off the system without properly shutdown. Repeat this until you get Windows Error Recovery message on start up. Select Launch Startup Repair (recommended) and press Enter Key

Window will load necessary files for recovery

Window will automatically try to fix the problems. This process usually take long time so stay cool, you need to do nothing here.

After a long wait [ around five to ten minutes ] you will receive following message

Windows cannot repair the this computer automatically.

Click view problem details

It will open problem details in message box. Scroll the message to bottom, at the end of message it contain hyperlinked privacy statement, click it.

Privacy statement will appear in notepad, Click Open option from File menu item

Click Computer to show all drive

You have to check each drive for Window. Drive letter showing here will be different from the drive letter you see in My computer while system normally boot. Open each drive and find out the partition which contain the windows installation files.

Open Windows folder

Open system32 folder

Change file type to all

Select Utilman file and do Right click and click Copy

Paste the copied file

Select the copied file and do right click and click Rename

We will change it with some descriptive name

Set it to Utilman-org

We have taken the backup of original file. Now delete the original file. Select the Utilman file and do right click and click Delete

Confirm delete operation

Now select the cmd file and do right click and click Copy

Paste the copied file

Select the copied file do right click and click Rename

Rename it with Utilman

We have replaced the Utilman.exe with cmd.exe

That's all we need to do here. Close the dialog box, close the file, and close the Startup repair box and Click finish

System will be shutdown. Turn on the system again, let the window boot normally this time on login screen click Ease of Access icon. We have replaced Utilman.exe with cmd.exe so it will launch command prompt instead of accessibility options dialog box.

Type following command and press Enter

net user administrator *

net user / Command
administrator / User name [ Replace it with user name if changing other users password ]
* / Set new password

Type the new password / Retype the password to confirm it. Be aware you will not see any asterisks [*] sign here when you type in your password.

Close the command prompt and use the new password to sing in

Wow we have successfully changed the users password now it's time to revert the change which we have made during the process. Open My Computer and open the window partition

Open System32 folder and select the replaced Utilman file

Do right click and click Delete option

Confirm delete operation

Select the Utilman-org file and do right click and click Rename

Rename Utilman-org to Utilman

We have restored the original file.

We have restored original window utility. To confirm it restart the system and click Ease of Access icon, this time it would launch original Utilman.exe

Congratulations you have successfully reset the users password without harming any window files or using any third party tools.