(1) Disable Firwall when you do network set up wizard. You can run it again. Once you set everything up, you can put firwall back.
(2) When you run network set up wizard, it is better to give network "Workgroup", not anything else. Do not know why, but it works for me and other people.
(3) To share files, you need to give premmision. Right click the directory you want to share and set to let network to share it.