Hi, and thank you for your question. My name is ***** ***** I'll be assisting you today.
First off, at the logon screen where it prompts you for the PIN, please click on the "Sign-in options" link just below and then click on the second button that comes up below the same.
You will now be prompted to type in the password ***** for your Windows account; are you unable to sign in this way either?
Please reply back using the box below, and then we will continue further.