To share folders using the built-in functions of the Operating System you need to enable File Sharing.
That tells me that you did other changes because by default enabling File Sharing on Windows doesn't expose everything only the Public folders if you didn't enable the option "Turn on password protected sharing", besides the Administrative shares no other folders can be accessed if not shared.
Something I always do is to disable that crap of "Use Sharing Wizard" and to simplify things make sure the same user name and password exists on both machines.
FAQ: How to disable Simple File Sharing in Windows? | OCIO
By the way Windows 7 and Windows 10 don't need SMB1 at all so don't mess with that because its an outdated and insecure protocol.
