Try this

Reset Windows password using CMD

Step 1: Logon to Windows as administrator (You also can logon in Safe Mode with Command Prompt, pressing F8 when restart your computer, hit up/down key to choose Safe Mode with Command Prompt and hit Enter).
Step 2: Click on Start, type cmd in the Run box or Search box and press Enter.
Step 3: Type net user, all user accounts of your computer will be listed.
Step 4: Type net user “UserName” “NewPassword”(replace UerName and NewPassword with yours), press Enter, then the password will be reset as new one and you can logon Windows