You may have noticed after upgrading to Windows 10, you can no longer access network shares.  You are 100% sure the login and password are correct but Windows is insisting your password is incorrect.  Or maybe you have disabled password protected sharing but it is still asking for a password.   This problem occurs when you have linked a Microsoft account to your login but have not setup (or you are not using) a homegroup.     To see what is actually going on, let's look into