title: Hyper-v network driver not signed
body: <p>I've recently moved a Virtual machine from a server to another one.
  Both the servers are running Windows Server 2012 R2 as the guest host.</p>
  
  <p>The generation 2 VM run almost perfectly, but it doesn't recognize the network adapter.</p>
  
  <p>Integration services are updated (if I try to re-install it it says they are already updated and doesn't let me repair it).</p>
  
  <p>On device manager I see the exclamation mark left to the adapter.
  If I let it search for drivers in C:\Windows it says that the "Network adapter for Hyper-V" is found, but it isn't digitally signed, so it won't be installed.</p>
  
  <p>Anyone could help me making this adapter work?
  I couldn't figure out how to remove and re-install integration services either...</p>