Virtual box is stuck at respawning....
If your linux kernel was just recently updated that breaks the vboxdrv module and it has to be rebuilt. This can cause what you are seeing. From the root prompt do /etc/init.d/vboxdrv setup. It'll go through some steps of stopping the driver and rebuilding it for the new kernel, finally restarting the driver. You should then be able to strt vbox and your vm.