Hello nums. Welcome to the Forum.
Things that can usually causes that is a device that is part of your system that does not have proper Plug-and-Play capabilities and does not have the correct
driver installed for it, or a phantom device that was not removed from the system properly.
But before anyone here can begin to think about what it could be we will need to know what we are working with. Could you fill out your "My System Specs" under your forum profile for us? Include somewhere whether this is a laptop or desktop and don't forget to mention any connected devices or peripherals on your system.
That will help us help you.