Reset the password by using Safe Mode way
There is a hidden default Administrator account that is created when your operating system is installed. Access that account to reset your password.

1. Boot your computer and press F8 repeatedly
2. Access
3. Key in "Administrator" in Username, with no password.
4. Go to Control Panel, then User Accounts
5. Select the account you want to reset the password
6. Change the password

If it doesn't help, you need to download Windows Password Key to wipe up the password, read more from its official website.

Hope this helps.