My setup: 3 year old HP Pavillion PC, 3 month old Acer Aspire Laptop, 1 month old E3000 Cisco router, HP Printer, 3 month old Windows 7 on both computers, latest downloads, etc. Current configuration: both computers connected to router via Ethernet cable. Printer connected to router wirelessly. Media streaming is on, Public folders are off, all settings dealing with sharing files and printers properly configured. Problem: each computer appears to be connected to a different network, but some communication between them is evident. However, cannot get PC to show Laptop as being part of network. Not using Homegroups; each computer is assigned to workgroup named WORKGROUP; individual files have all been configured for sharing, permissions, etc. Here's what works normally: Each computer can ping the other computer using names or IP addresses. Laptop network display shows PC as part of a network; PC is shown on the left with proper name and network shares listed. The PC shown on this laptop network page, media devices, "network infrastructure" and printer all show network location as "BusyBody." This is also the name of the router. WMP12 will recognize and play music in the PC's music library. Internet access OK on both boxes. On the other hand, the PC Network display shows an entirely different "network;" it is Ciscoxxx, which is the name of the PC's network adapter. The PC, all Media Devices, Network Infrastructure are all shown with Ciscoxxx as the network location. While the laptop shows the PC's IP address as 192.168.1.102 in its network list, the PC lists its address in its own network list as 127.0.01, apparently the "loop back" or self identification IP. Each computer, PC and/or laptop, when queried with "net view" command, generates a System 53 error - "The network path was not found." I'm baffled because the laptop appears to work and recognize a wired network, of which the PC is a part; but the PC does not. What should I try next? I've seen a lot of traffic concerning DHCP and using fixed IP addresses, turning off or hiding from view Microsoft Network Services, etc. It seems as if I have a really simple network, and I shouldn't need to do anything exotic. I must be missing something very simple and obvious.