After I upgraded to Virtualbox 1.6.0 a new PCI device has appeared in device manager (Windows XP SP2). I installed the new Guest addition, but that did not help. The guest settings are the same as before, only thing is that they were upgraded to the new 1.3 settings format. Windows XP reports the device as unknown, PCI Slot 12 (PCI bus 0, device 13, function 0). Everything works as before, does anyone know what this device are?