Currently back to using XP Pro SP3 and ESS 4.0.437. When I had Windows 7 RC 7100 (32-bit and 64-bit) up and running, and prior to installing ESS 4.0.437, I had no problems seeing the other systems on my network. After installing ESS 4.0.437, with Firewall in Automatic Mode, could no longer see any of the other systems on the network. Only solution was to disable Firewall. After Network Windows Refresh, all systems on network showed up, albeit temporarily. A reboot of Windows 7 and all systems on network would not be seen until Firewall once again disabled. Tried same scenario with Firewall in Interactive Mode. After putting in Password to remember rule several times, still could not see other systems on the network. Again, could only see other system after disabling Firewall, still only temporary; once rebooted, could not see other systems on the network until Firewall was disabled. Also noticed nothing in the ESS Network Connections Windows. Svchost.exe would show up only to disappear in 1 second or less.