Read original post at Timmy Kokke's Blog
I recently reinstalled my laptop with Windows 8 and Visual Studio 2012 to be able to develop Windows Phone 8 application on that. I thought every thing was fine until I ran the first application in the emulator.
I immediate got an error: “Something happened while creating a switch: Xde couldn’t find an IPv4 address for the host machine.” After some searching I found a solution that worked for me.