How To Diagnose and Fix Sound Issues in Windows 10
Sound problems in Windows 10 essentially happen for two reasons: a bad speaker configuration or faulty drivers.
How To Adjust Your Sample Rate/Bit Depth in Windows 10
Speaker issues can be remedied by changing the default sample rate/bit depth in your speaker settings. Right-click on the Volume icon (Taskbar) > Sounds. Go to Playback tab, select your speakers from the list of audio devices and click on Properties:
Go to the Advanced tab > Default format and try to find a Sample Rate/Bit Depth that will match your current speaker setup (this value usually lies between 24bit/44100 Hz and 24bit/192000Hz for most speaker models):
N.B. Click on the Test button to check if sound has been restored on your system.
Once you've found the right preset, click on Apply > OK to save your settings.
How To Reinstall Sound Card Drivers in Windows 10
If the above procedure didn't resolve your issue, try to reinstall the sound card drivers. Right-click on the Start menu > Device Manager. Expand the Sound, video and game controllers section, right-click on your sound card and select Uninstall:
Windows will attempt to reinstall missing the driver at the next system restart.
N.B. If Windows is unable to find the right drivers for your sound card, you can use software such as AIDA 64 to identify the model of the sound card, and then download the drivers directly from the manufacturer's website.