Amikor virtuális környezetben futtatod:
"Q. Can I install OEM software on a virtual machine (VMware)?
A. You can install OEM software in a virtual environment as long as you have a separate license for each instance of the software. It is fine to use the OEM version as long as it is properly licensed. To be clear, a separate version of the software must be installed for both the “standard” and “virtual” installations."
http://www.microsoft.com/oem/en/Pages/support-faq.aspx#fbid=bQpIU4jDWpx
A gond akkor van, ha migrálni akarod.
Azt csak a lenti OEM PUL (W8.1), vagy dobozos/VL-el (W7) lehet.