when I try to switch to virtual it endless loops and 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, 64 machine and dragon is up todate. Thanks for your help in advance.