I have just replaced my main XP computer with a Windows 7 64 computer. I have a Draytek Vigor2600 router with inbuilt VPN that connects to another similar router over the internet. Both local and remote computers are a mixture of XP, Vista machines, with some printers and other boxes. The local machines are all on 192.168.8.x subnet. The remote machines are all on 192.168.9.x subnet. With my old XP computer I could see all my local machines and all the remote machines. File and printer sharing, etc, worked fine and was reliable. With my new Window 7 64 computer I can only see my local machines, and not the remote ones. I can ping all the remote machines ok (those that I know the IP address of). I can make a connection to a particular remote machines using its IP number (as in \\192.168.9.xx\somefolder), but this assumes I know of the existence and IP number of the machine in advance (they do change). If I disable the W7 firewall some of the remote machines do appear sometimes, but usually disappear again quite soon. If this is a firewall blocking problem, how do I tell the firewall to allow it? Why, with the firewall disabled, to they disappear again? If it is not a firewall problem what else might it be? I have tried everything I can think of! Ted.