Click START>right click "my computer">properties>hardware tab>device manager
Next to where is says, "sound, video, and game controllers" click on the "+"sign. On the submenu, right-click on the Reltek (or whatever driver it is suppose to be) Audio Controller Then click on "update" and see if Windows will get you another driver on the Internet....When you first go into Device Manager, there may be a yellow exclamation point or red X on the problematic item.....if there is a red X, simply right click and then click "enable", then see if your sound is back.....If there is a yellow exclamation point....just right click on it and click "update" !!
If you don't see any "Audio Controllers" in the sub menu, restart the computer and tap the F8 key, when you enter Advanced Options, select "last know good configuration" and see if your audio driver returns.
