You need to install the drivers for the motherboard. Without those, your system will not perform properly, including internet connection, sound, chipset drivers, video (if you have integrated video on the mobo), etc. The drivers would have been already installed from the factory when you bought the unit, or if you built the computer yourself, they came on a CD that was provided.
If you do not have the motherboard drivers on a CD then you must go to your mobo's (motherboard) manufacturer's website and download the drivers for your make and model. If you do not know your mobo's information, go to the computer manufacturer's website (example, Dell, Hewlett Packard, Acer, etc.) and find the model of your computer and hope that they will either provide the system drivers for download, or at least tell you mobo information.
You can also download Speccy system analyzer, free edition. Install it and let it scan your computer, maybe it will post information about your mobo.