Machine of Windows 7 cannot see itself or other computers on the network.

I work with a volunteer organization, is attempting to add a new computer to their network. Add the new computer is a laptop running Windows 7 Professional (32-bit, 6.1 build 7601).

It is one of the three computers that connect via a wireless network, with the remaining three computers connected by Ethernet.
One of the laptop is running Windows 7 Home Premium (64 - bit, 6.1 build 7601) and the laptop rest and three desktop computers running XP Professional (5.1, build 2600).
The laptop running Home Premium has no problem with connectivity. He can see himself and all the computers on the network (with the exception of the new Windows 7 Professional machine). The XP machines can all be seen and also the machine Windows 7 Home Premium.
The Windows 7 Professional machine, however, cannot see itself, or one of the machines running on XP. It may, for some reason, see the Windows 7 Home Premium machine.
I can ping each computer on the network from him and he can ping other computers. I can even connect using his IP address and access the folders and files shared like this, but nothing I have seems to change him will appear.
I tried to disable the Windows Firewall and Microsoft Security Essentials, neither of which has an effect any. The computers are all in the same workgroup and network machines Win 7 is set to work on both.
I can't understand why this new computer should have these problems, I'm not a professional so there is probably something basic, I missed, but if anyone has any ideas I would be much obliged.
Thank you very much.

Hello

The question you have posted is related to Windows 7 connected to an organization and would be better suited to the TechNet community. Please visit the link below to find a community that will provide the support you want.

http://social.technet.Microsoft.com/forums/en-us/category/w7itpro

Thank you.

Tags: Windows

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