Hi,
In Command Prompt window, type net user Username NewPassword and press the Enter key.
Note: In above Command, replace Username with your actual User Name and NewPass with the New Password that you want to use.
Once this Command is successfully executed, you will be able to login to your computer using New Password.
Tip: If you do not know the Name of your User Account, type net user in Command Prompt window and press the Enter key. This will list the Names of all User Accounts on your computer.
Hope that works for you.
If that is not the case, please kindly attach a screen-shot of the issue so we could work towards resolving it.
Regards,
Lee