I'll try this, but I think the problem is something different. There used to be a window that would open every time I"d plug in - or unplug - a mic or headphone and tell me that it had been plugged in. That window had a drop-down that offered several options. I'm more than a little hazy on this because I never paid much attention, but once I had a similar problem, while I was still running 8.1, and I inadvertently pulled down the drop-down and saw there was an option to turn on the headset. I suspect this software switch is what got turned off when I "upgraded" to Win 10. I've been all over the computer trying to find a key to open this window but haven't had any success.
Still, maybe your idea will work.
I'm very happy there are folks like you who pay some attention to these forums. This is only my second visit to this one, but there's a graphics forum that I'm on regularly because of a graphics program I use every day, and for which I'm a pretty regular contributor, and, like here, it's always very helpful.
I can't try your fix right now - I do have to work sometimes - but I'll report back later with results.
MANY THANKS!!
Just an aside for whomever might be listening sometime, I was very leery of Alienware, I'm not a gamer but an artist, but I"m very happy with it. The display is WONDERFUL, the very best colors I've ever had on a computer, otherwise it's generally fast with big graphics files and it's overall a competent machine. But, the display will blow you away.