CAN'T CREATE A WINDOWS 7 COMPUTER'S "HOMEGROUP" OR CHANGE ITS "WORKGROUP"

The Windows 7 Home Premium 64bit machine is connected to a "Home" (Windows 7 nomenclature)/"Private" (Windows Vista nomenclature) network. Yet, when I try to create a Homegroup (which I'm told in the Network and Sharing Center it is ready
to create) I get a message that "a homegroup can only be created on a home network". But the computer IS on a Home network, is discoverable and is sharing everything. Oddly enough, in the Windows Explorer, listed as being on the network, IT IS NOT
ACCESSIBLE TO ITSELF! This is the message I get when clicking on any of the computers on the network:
"\\[ComputerName] is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have accesss permissions.
The specified network provider name is invalid."
When I tried to change the computer's Workgroup I get "A general network error". I have also found that ""Windows could not start the PNRP Machnie Name Publication Service on Local Computer. Error 5: Access is denied."
What can I do to fix this problem?

Hello dazimon,
If my understanding is right, you can access share folder from other computer, but you can’t open localhost share folder from the Network in the Windows Explorer.
Do you mean that if you click other computer in the Network will receive the error message ‘\\[ComputerName] is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have accesss
permissions.
The specified network provider name is invalid.’  ? 
Please check if you have the permission to access other computer.
In your last reply, do you mean that you have Cisco Firewall ACL to deny the network traffic?
Please take the following steps for troubleshooting:
1. Go to Control Panel\All Control Panel Items\Troubleshooting\All Categories, and run Homegroup troubleshooter
2. Temporarily disable the Cisco firewall and check if the issue still exists
3. We could turn off the Windows Firewall to check if the Windows firewall block the access
Best regards,
Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

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