jamalekai

There is much easier way than doing a full restore as "Art" suggested.

Log in to your primary account using your finger print.
Create a NEW ADMINISTRATOR ACCOUNT (control panel>User accounts)
Log out of your primary account (the one you used your finger print to log in to)
Log in to the NEW ADMINISTRATOR ACCOUNT that you just made
Get back to the User Accounts screen
Select the account you want to remove the password for, and then click remove password.

Next time you log on, you won't have a password. You can add one after logging on either in the User Accounts screen, or by ctrl+alt+delete and then clicking change password.

Good luck