I have a Mid 2012 MacBook Pro running 10.10.3 with a Thunderbolt External drive holding my BootCamp Windows 7. When I attempt to make a VM for BootCamp I get the upgrading My BootCamp progress bar that goes about 1/4 of the way and stops.I then get a dialog box that states "You need to log in to Windows to complete configuring your virtual machine."After this nothing that I have tried works. I Know that it is a problem booting the Macbook Pro from an external drive, but I've configured Windows to boot fine. I can not believe that I am the only one with this problem. It must have been solved before, but I can't get the forum and KB search to show me anything helpful.