I have a workgroup with 8 computers and none see each other. They are using xp, Win 7, win 8.1, Windows 10. Some are wired others are wireless. All in the same workgroup named "Workgroup". On the Win 7 I have a shared folder shared out to "everybody". The Win 7, 8.1 & 10 all have Network Discovery and file sharing turned on. None are on "public Network". Any ideas why this network is doing this?