Well first off don't try to change the voltage in eleet, people have had mixed results with overclocking from whiten windows without UEFI. I also believe there is a pad for this so you can also measure it with a voltmeter to see if its just the software that's reporting incorrectly. For sound, first thing is to make sure that its enabled in the bios. Other thing to check is if you have front panel audio ports hooked up, sometimes the realtek software will thing something is plugged in it when there is nothing there and turn off the rear audio ports. I forget exactly where the setting is right now. 
 
Edit: Found it, under "Device Advanced Settings"(upper left for me, just blue text) uncheck the mute rear device when front headphone plugged in.