When I run my Windows 8 BC partition as a virtual machine, Windows is no longer activated and I cannot activate. Every time I activate, I get "thanks, you're all done", but the activation status hasn't changed. I even run slmgr.vbs /upk to uninstall my product key and input it again, but activation status has not changed. Office is fine.
And the other thing is whenever I switch between booting natively and a VM, my Metro apps stop working until I repair them from the Windows Store.