If any of the following is true -
1. network ID button is disabled in 'computer name' section
2. you cannot change your workgroup
Then you need to install the 'Client for Microsoft Networks' on your LAN/Wifi.
1. Go to Network Connections
2. Right click on your LAN/Wifi, and then Properties
3. If 'Client for Microsoft Networks' is un-checked, then check it.
4. If it is not there at all, then Install the client
5. Restart, and you should be good to go :-)