Following advise from Windows Secrets, I moved one of my laptops onto Windows own Security including the Firewall. The other two systems are running ZoneAlarm Extreme... Recently the laptop has stopped appearing on the network or homegroup, or seeing the other systems on the LAN. This is particularly noticeable when the system has been "sent to sleep".

However after a fair amount of digging, I discovered that if I turned the Windows Firewall off and immediately the laptop appeared on the network and homegroup and could see the other two systems. Once up and running the Firewall could be turned back on and the system appears to remain operational !!

Am I the only one, having this problem. Strange how ZA seems to be quite happy on the other laptop when that goes to sleep and the wakes up !!