Method 1: Download the AMD Catalyst™ software suite from www.amd.com/drivers, which is packaged with the driver for the AMD High Definition Audio Device.

Run the program and update the driver as instructed.
Method 2: Update through Device Manager.
1. Go to Device Manager by pressing Win+R together to open the “Run” dialog, enter devmgmt.msc.
2. Look for your audio device from the list, right click on it and then select “Update Driver Software…” in the pop up menu.
3. Select “Search automatically for updated driver software“. Follow the instruction and finish the process.
Note that updating through Device Manager isn’t as efficient as we would usually expect. Often it may not be able to find the driver software, and the process can be time-consuming and somehow confusing.
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If you still don’t get the sound working after you update the driver successfully, then maybe you haven’t enabled the AMD HD sound device properly, refer to this post for possible solution.