You can't switch a physical l machine fror one OS to another - you have to dual boot. However if you have a Windows verison of WS and Linux Version of WS you can copy a VMware guest machine from one to another - Winddows to Linux and vice versa using the ntfs-3g driver. I do this all the time and it works fine. You should the WS program that you have copied the VM - which of course yo have - the default. But you still have to switch between Linux and Windows OS by dual booting. Perhaps you can do this with 2 physical machines - havfen't tried it ye However I have used Hyper-V for something similair - on 2 machines of course. If you find a way to do this on 1 machine please let the world know how you did did it.