There is a problem with Win 7, perhaps just on the x64 version, with name resolution on a local network. The problem is not affecting every user and, at least in my case, it is intermittent. For a good description, see this thread: http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/3854e5a9-6cea-4fd5-8736-d0c35373ddf5.I found for example that I can connect to a public printer and a public folder (shared with Everyone) on my home XP SP3 machine from my Win 7 x64 machine when Win 7 x64 is first installed. However, once I connect to a different network when traveling with the Win 7 x64 laptop, I can no longer connect to that same printer or folder upon returning home, even after rebooting the Win 7 laptop. The XP machine shows on the network map, but attempts to connect to it result in the 80004005 error (Windows cannot access \\machinename) as described in other threads. Reinstalling Win 7 resolves the problem, but only until the next time I travel.I borrowed a Vista laptop. The Win 7 laptop can connect to the Vista laptop and the Vista laptop can connect to the Win 7 laptop. The Vista laptop can also connect to the XP SP3 machine and see the public folder and the public printer.When I type the IP address rather than the machinename in Windows Explorer on the Win 7 x64 laptop (\\192.168.1.103 for example), I can see the contents of the shared folder and connect to the shared printer. Since the network uses DNS, making persistent connections using IP addresses is not desirable.I have searched for a solution to this problem for about a month. I welcome additional ideas.Thank you.

I suspect that after you connect to other networks, some configurations changed so it does not work properly when you at home. Did you connect to a simple network or a domain when you travelling? When the issue occurs next, I suggest you check NetBIOS over TCP/IP settings. 1. Click Start, and then click Control Panel.2. Under Network and Internet, click View network status and tasks. 3. Click Change adapter settings.4. Right-click Local Area Connection, and then click Properties.5. In the This connection uses the following items list, double-click Internet Protocol Version 4 (TCP/IPv4), click Advanced, and then click the WINS tab.6. Click “Use NetBIOS setting from the DHCP server”, and then click OK three times. If the issue still occurs, I suggest you temporary disable the firewall and antivirus, then check the result.Arthur Xie - MSFT

Arthur,Thank you for helping with this issue. The wireless adapter was already using NetBios setting from the DHCP server. The problem is also present with an Ethernet connection.I disabled McAfee and the Microsoft Windows firewall on all computers and the problem persists.What would you suggest next?Michael

I seem to have the exact same problem. Did you ever find a solution?