MTaimur,
I would like you to try a clean boot, this removes a lot of unnecessary startup services, some drivers, and programs that aren’t necessary. In other words using process of elimination.
This document will provide the steps to show you how to do a clean boot. Once that is done, test out your audio.Please follow the instructions exactly how they show so you don’t accidentally disable the service for the audio.
Please respond back at your earliest convenience.
Thanks