If the user has a problem upgrading to WIN10 preview 10166 and has updated the sound card driver, you can use the following steps to tell Microsoft that the company will be using these feedback to solve the problem for the appropriate sound card manufacturer:
1, search the Cortana search bar DxDiag.exe (DirectX Diagnostics Tool), and run
2, find the "Voice" tab, click the "Save All Information" button below
3, will save the content and you encountered the problem description to send to mediaq@Microsoft.com
There is not much time left for Microsoft to solve the WIN10 problem, and the company hopes to resolve all the "mishap" before the WIN10 official version arrives on July 29. However, most users now use the WIN10 Preview version of the process has been feeling more stable, basically do not have too many serious problems. Hope that the WIN10 official version of the user can bring a more perfect use experience.