Actually Forbo was giving some good advice. The c920 is known to malfunction quite badly, and worse, erratically when plugged into a USB 3.0 port.
A webcam mic is going to be far worse quality than any headset; it will pick up a lot more ambient noise, reverb/echo, and your sound quality will change depending on your positioning relative to the cam. Most of the problems of a large-capsule mic, with the added fun of being worse quality as it has to be stuffed into a tiny cam enclosure.
Removing and re-adding the cam will work for some issues, but it isn't a full-on fix.
Glad to hear it worked in your case though! :)