Windows, OS X, Linux oh my! Run all three together using VirtualBox by Sun Microsystems - Using Your Virtual Machine
Using Your Virtual Machine
Now how do you get out of your guest OS to return to comforting reality? Just treat your virtual machine like a real computer. If you're running windows, head over to the start menu and click "Shut Down." It's that easy.
When you come back the next day after you have removed your installation disk or deleted your ISO, you might be frightened by a message stating that the device originally used to boot the virtual machine is no longer available. Disregard this message and click "Start." There is no need to worry since your virtual machine is safely installed on the .vdi image. Only if that were to disappear would you be in trouble.