I have a Razer Megalodon USB headset. It works fine on both arch linux, and osx. However on my windows 7 64bit install I can only output audio, or only input audio. So if the mic works, I can't hear anything and if the speakers work I can't use the mic. I have the latest drivers for my mother board installed and all recent windows updates as well. I suspect it has something to do with drivers but I am not sure.