Ok, but I think that those 2 virtual machines have pretty much the same "hardware" (motherboard, video card, HDD type...), isn't it?
Once AutoCAD is activated, if you change too many computer base components it will ask to be activated again.
When you try the virtualized AutoCAD on the real computer, it will "think" that you changed some components and ask again to be activated. But the virtualized AutoCAD can't activate well because some registry entries and/or files are missing (or perhaps it uses a service which can't be started well).
I notified the Spoon Studio team about this a long time ago, they said they are working on it but still it's not fixed.
Do you intend to use this virtualized AutoCAD only on your work computer or on any other computer (with your USB key/flash)?