Facing the error 0xE0000227: HD Audio Bus Driver Failed to load when trying to install Realtek HD Audio Driver ?
Here’s the fix.. First, make sure you have the latest drivers. Else go to realtek and download the latest version of your driver

1. Go to Device Manager/Device Drivers

2. Find Microsoft UAA HD bus driver under System Devices

3. Disable it and then remove it

4. Close Device Manager and run the Realtek installation again