|I would compare a working machine to a non-working one. |
Open an elevated command window: Start menu, type CMD in search box, right-click on CMD and Run as administrator.
In the command window type: ipconfig /all >%userprofile%\desktop\ipconfig.txt (You can copy then right-click in the command window to paste)
That will place a text file on your desktop. Do this on the two machines and compare, or paste the results here and someone hopefully can interpret them.