Reinstalling the drivers is an option.
However, before doing so, try the Windows 10 built-in troubleshooters.
WIN + I > Update & Security > Troubleshoot > Playing Audio.
Try troubleshooting "Hardware & Devices" also.
Another option is to just right click the small speaker icon in the lower right screen corner. Select Playback devices - check the various screens, tabs, and properties settings.
If the above does not work then just reinstall the driver.
Just be sure that you download the correct and most current driver via Realtek's website.