It would have been easier if the Windows Operating System was mentioned, but still considering if you have Windows 8 or Windows 10 installed, Please follow the instructions mentioned on the link given below:
http://windows.microsoft.com/en-us/windows-live/account-reset-password-forgot-faq
If you have forgotten your Windows 7 password and you are on a domain, you need to contact your system administrator to reset your password. If you are not on a domain, you can reset your Windows password by using a password reset disk or by using an administrator account.
To create a password reset disk, follow the steps mentioned in the Microsoft support page below:
(Note: Before starting with the steps in the following link, make sure that you have selected "Windows 7" in the drop-down menu at the start of the page).
http://windows.microsoft.com/en-in/windows/create-password-reset-disk#1TC=windows-7
To reset your Windows password by using an administrator account, follow the steps mentioned in the Microsoft support page below:
(Note: Before starting with the steps in the following link, make sure that you have selected "Windows 7" in the drop-down menu at the start of the page).
http://windows.microsoft.com/en-in/windows/reset-windows-password#1TC=windows-7
(Important: If you forget the administrator password and don't have a password reset disk or another administrator account, you won't be able to reset the password. If there are no other user accounts on the computer, you won't be able to log on to Windows and will need to re-install Windows.)
To know more about resetting Windows 7 password, refer to the following Microsoft support page:
http://windows.microsoft.com/en-in/windows/what-do-forget-windows-password#1TC=windows-7
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