I am trying to share files across 3 computers, 2 HP desktops and a toshiba notebook. They are connected to a Linksys Wireless Router with 4 wired ports. They all belong to the same workgroup. The toshiba notebook and one of the HP desktops can see the other computers, but are unable to access anything on them. File and printer sharing is turned on on all computers. NetBIOS settings are set to enable over TCP/IP. TCP/IP is the only protocol installed. Client for Microsoft network is installed and enabled. The last HP desktop gets an <workgroup name> is not accessible you might not have permission to access it. If I type "ping <computer name>" the name gets correctly resolved to its IP on the internal network, but the actual ping times out for all computers pinging any of the other ones. They can all access and ping anything outside the network. I don't think it is has anything specific to do with the router as the two desktop also have Ubuntu on a dual-boot and they are networked and can ping each other across the network. However pinging the Windows notebook from them results in the same problem, name resolution works but the actual ping fails. I am trying to network these and get file sharing. Getting the Windows file sharing comes first. I would appreciate any help. Thanks

I suggest you check IP addresses. On the Windows systems use ipconfig and on the linux use ifconfig. I suspect at least one does not have a valid IP address, subnet mask, or default gateway for your network. If any of the Windows systems IP addresses start with 169 is not connecting to the network. Also, try temporarily turning off all firewalls.

are you running any kind of port blocking software? Like Mcafee antivirus, which blocks pings!