[SOLVED] Copy Virtualbox Win XP from Ubuntu to Linux Mint on dual-boot PC

Hi,

I have a dual-boot distros on my laptop (Ubuntu 12.04 and Mint 13) with virtual Windos XP (using VirtualBox), installed on Ubuntu. I want to copy that Windows to my Mint.
What should I do?
Sorry if there is a thread for that already, but I couldn't find it.