So I was using Skype to voice-chat with some of my friends from school, and all was fine. Suddenly, Windows started looping the audio output from my computer through the mic and my friends could hear themselves and all the crap going on on my PC at the time, without me telling it to. I was wearing headphones, so I knew it's not any issue with the microphone picking up the speakers. Also, the microphone still picks my voice up, but very faintly; not anything that you could make out.
This is the second time Windows has done this, and the last time it was solved, I had no idea what actually did solve the issue (rebooting didn't work, but it suddenly stopped after about an hour of fidgiting). Why the hell is Windows doing this?