Genuine Dell 1820 A DW1820A WiFi Carte WLAN Dual-Band. Learn more opens in a new window or tab. I still do not know if this is the correct driver or not for the dw1470 mini-pci wireless network adapter installed in my old c640 latitude.
you may not have the bluetooth driver installed. Go to dell support, look up the 370 minicard under wireless devices, and download that driver. Once it's installed you will have the tray icon where you can connect your bluetooth device.