Using the Samba gui you have to set the windows account you want to use. So under Administration -> Samba. Preferences -> Samba Users. Add a user and enter your windows machine username and password. When you get the prompt that username and password.
Looks like did that but did you enable sharing on that windows account. In windows control panel look for the option to enable file and printer sharing. You can turn on password protected sharing or the guest account access, enable one. Also ensure the windows firewall isn't blocking anything.
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