Not sure if I understand what you mean by shutting down first? After uninstalling and unplugging the devices I restarted the PC and tried plugging the devices in again, but with the same result. As soon as I plug them in the both appear in Device Manager under Other Devices but not in My Computer.
When I plug them into my laptop they immediately appear in Device Manager under Universal Serial Bus controllers and the hard drive also appears in My Computer, likewise when I plug a memory stick into the 4 port usb hub it registers in My Computer as a removable disk (E).