switching to virtual only increases cpu and will not start up, have to reboot?

When I try to go virtual mode the program sits in the back ground using the cpu but does not finish. I have gone into the task master and tried shutting it down there but no success, have to reboot. I have tried the old fix of resetting the sand box but that is not working. Im running windows 10 and have 64 machine and my dragon is up to date. Thanks for your help in advance.