Assuming that it is running on Windows 10 (recent purchase), make sure you are connected with Ethernet and that you can connect to the internet. Go to Control Panel- Device Manager and look for the wireless device. If it has a yellow triangle on it then it means that there is a problem with the driver or the hardware. Right click on the wireless device and select Uninstall and if it asks click the box to delete the driver. At the top of Device Manager is a tab called Actions, click on it and select Scan for Hardware Changes. This should force the OS to download the driver and install it. If this is not running on Windows 10 then this may not apply.