high definition audio controller is not working on Acer xc-603 Windows 8.1. Downloaded drivers and no effect.

[Revmax]

High definition audio controller

 

[Phillip Corcoran]

There is no such model as Acer X-603, I think you mean Acer Aspire X-603?
Try installing the "Chipset" driver first, then install the audio driver again.

Make sure you use the correct Acer website for your country and that you select the correct Windows version, and be aware that they are 64-bit drivers (no 32-bit drivers available).

For US/North America models only: http://us.acer.com/ac/en/US/content/drivers
For other countries go here: http://www.acer.com/worldwide/#_ga=1.73706450.196805269.1428926795