So I installed Windows 10 (works pretty well by the way), and one of the first things I did was spin up my VM’s again. That worked fine… Installed VB 5, started all the machines, yey!
Then I had to reboot… After the reboot VirtualBox told me the NIC was missing and it couldn’t select a network interface to bridge to, even though it worked fine before the reboot.
To fix this, open up the start menu, find Virtualbox and right click on the shortcut. Press Open file location. Once you’ve done that and the new window has opened up, right click on the Oracle VM VirtualBox shortcut and select Properties.
Go to the Compatibility tab.
Check off the box that says Run this program in compatibility mode for: and select Windows 8 from the drop-down.
Restart VirtualBox and check if your network interface is back
If the network interface does not show up after restarting VB, try rightclicking and choose Run as administrator from the menu.