Just installed the Windows Phone 8 SDK and got disappointed when running the sample app on the phone emulator failed with the following cryptic message:
The Windows Phone Emulator wasn’t able to create the virtual machine. Something happened while creating a switch: Xde couldn’t find an IPv4 address for the host machine.
Some people suggested that the problem might be related to the VirtualBox being installed on the machine (I had it). Uninstalling VirtualBox helped, although it is a bit annoying, as I need VirtualBox to access my work VPN.