There is nothing like that your device won't work if you do not Install a Realtek HD Audio Driver, but you should install them if you want to use your device in the best possible manner. The Realtek HD Audio Manager is the controller of your audio adapters and thus to get the smooth audio experience, you need to install the drivers of it. It is also responsible for providing you the freedom to manage your device’s sound settings. If you are wondering “How to install Realtek HD Audio Driver in Windows 10”, it is very easy, you can get it from the official website of Realtek. Once downloaded you need to run the setup and then follow the on-screen prompts to complete the installation.