Hello, this is Emily.
Are you currently using your Microsoft account to sign into Windows? If so, your Windows password is your Microsoft account's password. The same password you use when you sign into http://account.live.com.
If you are using a local user to sign into Windows, your Windows password is your current local user's password, basically the password you use to sign into your Windows.
Let me know the context here so I can perhaps help you further solve anything you are trying to solve.