You know when you can hear the mic in your headset, background noise and all? Well every time I turn on Vent, or go into setup and press ok, my mic "preview" feature, where you can hear yourself, turns on. What I have to do is right click on the speaker and go to playback devices and double click speakers and go to the levels tab and unmute Line-In. What happens is that Line-in and Auxilary end up muting themselves which for some reason turns my mic feedback on. I had the exact same issue in Vista. Very annoying, no idea how to fix it.