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Open the Dell Latitude E5400"Start" menu and navigate to "Control Panel." Click "System and Security" if your E5400 came with Windows 7 or "System and Maintenance" if it came with Windows Vista.
Choose the "Device Manager" link. Windows Vista also requires you to click "Continue."
Click the plus sign next to the "Bluetooth Devices" entry near the top of the list of devices. Right-click the entry for the Dell Latitude - E5400 internal Bluetooth adapter and select "Update Driver Software."
Select the option to "Search Automatically." Click "Finish" after the latest driver is downloaded and installed.
Close the "Device Manager" window. Locate the blue "Bluetooth" icon in the notification area at the bottom right of the screen. Right-click the icon and choose "Enable Bluetooth."
Turn on your Bluetooth-enabled device, such as a cellphone or PDA. Navigate through the device's menu to the "Bluetooth" option and select "Enable Bluetooth," or the equivalent option for your device.
Right-click the "Bluetooth" icon on your Dell Latitude D600 again and choose "Add Device." Click the name of your detected Bluetooth device and click "Next" to connect to the device.
Check the device manager to see if the drivers for the infrared device are there. If they aren't there, then go to Dell's site and download them. If they are, unistall, reinstall, the check Dell's site for updates. If the device manager shows everything working properly, the device itself may be malfunctioning. The same procedure for the bluetooth device.