I'm not sure how you have it setup, but I can probably help. For any step that you get stuck on, be sure to check the samba logs, usually found at /var/log/samba/xxxxxx (where x is the computer/IP you are accessing from). You can use "tail" to get the last few messages. This can give you hints as to what is going wrong ("Password incorrect", "Access denied", etc).
On the server, did you create the user audioaficionado and set the samba password ("smbpasswd audioaficionado")? Did you make sure that you are added into the share that you created? If you modified the samba configuration, did you restart the service?
Windows also seems to be adding the computer name "Trinity" to your authentication, which can cause issues. Click on "Use another account" and type only the user you are trying to connect as.