Hello,
Please try these suggestions:
Upgrade your system to latest version. If you're already on latest version, make sure you installed latest update released.
Go to your device manufacture's website and download latest audio drivers for your system model. Or download Realtek's HD audio driver(s) directly from here:
Hope this helps!
Note: Realtek.com is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.