Im trying to run it as a vm on virtual box and when i start it and add the device i get this message:
Failed to open the optical disk file /home/chritian/Downloads/kali-linux-1.0.9a-amd64.iso.

Could not get the storage format of the medium '/home/chritian/Downloads/kali-linux-1.0.9a-amd64.iso' (VERR_NOT_SUPPORTED).