I see this all the time with people using Norton Internet Security. It doesn't automatically include the local IP range in the Trusted list. You need to manually configure the Firewall to add the internal IP range (192.168.x.1 - 192.168.x.254) to the trusted list.
I am running a four node wireless network in my house. All the computers are running windows XP pro/home and all can browse the internet fine. The wired computers can browse shared folders ok too. The wireless computers cannot, however.
1. All the user accounts are the same on all computers
2. The workgroup name is the same on all computers
3. I can ping all computers
However, when I do: start --> run --> \\computername
it gives me the aforementioned error.
In addition, when I browse to my workgroup, I can see all the computers there, I just cannot access the computers that are connected wirelessly. Any ideas? I am stumped.