USB Headset recognized and "working properly" but no sound.

I've been using a pair of Grado sr60i (http://www.gradolabs.com/page_headph...80bd531134b668) for a few years now. I replaced my old USB gaming headset (http://www.tek-republic.com/th-pro.html) with them. My grado's died and I wanted to use my old USB headset, however when I plug them in there is no sound. I installed the newest software and updated my mobo sound driver. Checking under device manager it says that the device is working properly. It is set as my default playback device. The volume controls on the headset are responsive. When I mute then windows mutes as well. The volume buttons change the volume indicated by the volume mixer. I don't know what else to do. Are there conflicting drivers I should know about? I'm at a loss. I've been searching the internet for a solution for hours now to no avail.

Hardware:
Gigabyte GA-EP45-UD3R Mobo

List of drivers displayed by Driver Sweeper:
http://imgur.com/qso1cKa

Also, I just got an Nvidia video card, do I need that AMD display driver?
Any help would be greatly appreciated!