The 'mic' showing up is pretty common, when using a headset. According to my computer I have 3 recording devices hooked up to my PC, none of which are for recording.
As far as the issues go with the reset, try to right click on the volume option (bottom right hand corner on Windows 7), and then go to playback devices. Disable all options but your Sony Headphones by right clicking them and hitting disable. This should help...
I hope. I'm not really good with computers, but every time I had trouble with sound options, this has helped me.
As far as the electric noise... I'm not sure but I believe some modems/routers can cause interference with blutetooth headsets.When I had my PX5's a few years ago, I got constant interference and static noise due to my modem/router being too close.