1. Check that you have pluged audio cable from case to motherboard. If dont know then try audio ports from behind pc straight from motherboard
2.check your motherboard support page and download audio driver!
how do I put this. Usually when you see the green bar progress it is very smooth and opening up the pop-ups when doing installation right? So for my case sometimes it slows down. Yeah its difficult to explain. Maybe need to record it.
maybe using wow as an anology is better. if your playing the game with too many people crowded into one area, no matter what pc you use if theres 200 people in one small box it lags right? something like that