Hi,
My machine originally came with windows 8 and the webcam was workring fine. Then 8.1 came and upgraded my install and I have had the "unknown device" issue ever since. I downgraded the laptop to windows 7x64 and it's still there. All drivers were installed in the correct order, installed and reinstalled all usb hubs and controllers and it's still showing "unknown device." I've even installed the Dell Webcam software to no avail. Can anyone tell me what driver to use for this as it's driving me nuts and I would like to use it for my company's video conferences.