I am doing following steps
new ,pick aname..and choose mac os
click next twice..then choose create a new virtual hard drive
i choose .vdi
then choose dynamically allocated,thengo next..
i click on settings later, go to system..and uncheck enable EFI ..
then i go to sotrage and choose on empty my os file..
i choose my iso file.
i click on ok later, i start my os...i get fatal no bootable medium found! system halted