WindowsXP mode and MerSDK (oracle virtual box) Guru Meditation [not a question]
If your SDK is installed on Windows7 or such, and need to use WIndows XP mode (Windows own virtual thingy), it will spoil running instance of Oracle virtualbox (MerSDK).
MerSDK will enter in Guru Meditation state, which you can't recover through gui.
You can forcibly shutdown MerSDK from command line,
C:\Program Files\Oracle\VirtualBox>vboxmanage controlvm MerSDK poweroff