This solution worked! For those who still struggle with this issue, I'm going to repost the "fix information" with a small bit of updated info:
go to Device Manager, double-click on Sound, video, and game controllers. Then double-click Realtek Audio, go to Driver tab, then click Update driver. Select Browse my computer for driver software, then Let me pick from a list... If there are two options, choose the first option. If that one doesn't fix it, then install the 2nd option. One of these (if you have two choices) should if it!