Searched Google and found this problemwas experiencedby others earlier in 2008 but have been unable to uncover any fixes that actually worked.Problem:1.My 64-bit Vista machine can see other 32-bit Vista machines on the network but is unable to see XP or Server 2003 machines.2.Cannot see XP or Server 2003 machines in the "View Computers & Devices"or"Network Map" windows of the64-bit Vista machine.3.Cannotpingthe XP machines withthe 64-bit Vista machine Oddly enough, I can successfully ping the Server 2003 machines withthe 64-bit Vista machine& the 32-bit Vista machines can see the XP & Server 2003 machines without difficulty, the trouble is with the 64-bit bad-boy...Have tried disabling all AV software / firewalls on the 64-bit Vista machine, re-booting machine, trying again... Have even moved to the same switch on which the 2003 machines are located, all to no avail.Does anyone have a solution to this problem other than upgrading the operating system on myXP & Server 2003 machines? I really need to get access to these servers and don't feel like hoofing it over to their location and using a thumb-drive over and again...Update: Can now access the Server 2003 machines by going to Explorer on the 64-bit machine and puttingthe 2003 machine IP in the address bar after "\\". i.e.:\\xx.xx.xx.xxx Still cannot see or ping XP machines or see the 2003 machines in the"View Computers & Devices"or"Network Map" windows of the64-bit Vista machineThanks!

Hi, Thank you for your post. Could you please tell me which changes have been made on the computers recently before the issue occurred? If everything worked before, a quick solution is to restore the system back to the previous status when the issue didnt occur with System Restore. (Note: Performing a system restore may cause the loss of the current system settings; therefore, before doing this, please make sure that the system restore point is not too old and set a restore point for the current status.) Based on my research, I would like to provide the following suggestions: 1. Please ensure that all the updates have been applied on all of the computers. 2. Please make sure that the Link Layer Topology Discovery (LLTD) has been enabled on the Windows Vista computer and the Link Layer Topology Discovery (LLTD) Responder has been installed on the Windows XP computers. Link Layer Topology Discovery (LLTD) Responder (KB922120) http://www.microsoft.com/downloads/details.aspx?familyid=4F01A31D-EE46-481E-BA11-37F485FA34EA&displaylang=en 3. Please check the sharing: 1) Please try to access: \\127.0.0.1 to check if you can see you local sharing. 2) Access other computers share with both \\computer name\folder and XXX.XXX.XXX.XXX\folder to see if they are works. Regarding the issue that Windows Vista cannot see Windows XP computers, it is related to browser service and I will share the following information with you: For Windows Vista computers, please ensure "Network Discovery" is turned on in "Network and Sharing Center". Also, just for your reference, in Windows network environment, there is a service called "browser service" which is responsible for maintaining a "browser list" which is a list of computers in the network/domain. This is designed for performance purposes: every system does not need to hold a computer list for itself. Instead, the Master Browsers in the network/domain collect the computer list for the whole network, and provide the list to other systems. Therefore we can see the computer list in "Network" because the system can get the list from the master browser of that network/domain. Actually, as the "browser service" is a legacy service, if it is not need to browse the whole network computers in "Network", we can ignore safely this event. For more information regarding browser service, please refer to: TCP/IP Fundamentals for Microsoft Windows (See "Appendix C Computer Browser Service", Page 518) http://www.microsoft.com/downloads/details.aspx?FamilyID=c76296fd-61c9-4079-a0bb-582bca4a846f&displaylang=en 188305 Troubleshooting the Microsoft Computer Browser Service http://support.microsoft.com/default.aspx?scid=kb;EN-US;188305 Hope this helps. Nicholas Li - MSFT Nicholas Li - MSFT