This week update has broken lots of DHCP networking.

For further reading have a look at http://www.theregister.co.uk/2016/12/13/microsoft_windows_10_broken_networking/

 

To fix try one of the following:

A full shutdown (holding shift) has fixed some users with this bug (often updates apply at this point)

Open a ‘Command Prompt’ in Administrator mode and enter “Netsh winsoc reset” followed by the <Enter> key.
If this fails then delete the network “nic card” using the “Device Manager” and then auto discover and reboot the computer.