I am trying to create a homegroup for my CPUs on Windows 7 over a wireless network. I have 4 different computers that I have tried. None of them can see each other. Each one asks to create a new homegroup, rather than join an exiting homegroup. I have uninstalled Nortan Internet security on main PC. (second one does not have firewall). I have disabled Windows firewall. When I try to ping another computer, I get the message "destination host unreachable." with 0 percent lost. One of the computers, I have just installed windows on for the first time today. There is nothing else installed except for device drivers. All computers can access the internet. When I click on my router, I can see all computers that are connected to the wireless network, but they cannot see each other.