Be forewarned, I'm a senior citizen and, although I've used them for many years, am not a computer whiz on how they work. Hence I will relate what I do in perhaps boring detail, and will require detailed instructions.
I right clicked on This PC, clicked on Properties; this brought up the Control Panel page.
I then clicked on Device Manager. On Audio Inputs and outputs four icons showed up: 1) Microphone (Realtek High Definition Audio), 2)Microphone (USB2.0 MIC), 3) Realtk Digital Output (Realtek High Definition Audio), and 4) Speakers (Realtek High Definition Audio)
I clicked on numbers 3 and 4. In the General Tab and in the Drivers Tab, it reported them working properly and when I clicked on the Drivers Tab it reported both were updated 10-29-15.
I also, in the Device Manger window, clicked on the Sound, video and game controllers. Three drop down icons showed up: 1) Inte® Display Audio, 2) Realtek High Definition Audio, and 3) USB2.0 MIC. AGAIN, all showed to be Working Properly.
Lastly I clicked on System devices. A multitude of drop down icons occurred. I clicked on System speaker and it reported: "No drivers are installed for this device."