DTS Audio Control Issue

I'm not entirely sure how to go about this, since I've never had this much of an issue with a PC before so forgive me if how I'm saying this seems scattered or doesn't make sense. Feel free to ask for any info needed to help fix the issue, though you might need to give me instructions on how to get that info since its been a while since I used a newer PC.

Anyway, I've had this PC I bought about a year ago and never got to using until recently. Its refurbished, but it works really good, except when it comes to a headset. This PC itself has two headphone inputs on the front. One is for headphones only, the other has a headphone/mic picture, so I assume it would work for normal headset with one jack that works both. It does, just not together. Whenever I plug in a headset, it launches the DTS Audio Control program, which then prompts me to pick what I want to do with it. It gives me three options. The first is Line In, then Mic, then Headphones. I've tested all three options, trying to use both my headphones and mic at the same time. The Line In and Mic options will only use the mic, where as the Headphones option will only allow me to hear audio through the headset. So both options work in this input, but they won't work together. I've spend days trying to fix it, I've scoured the internet to see if others have the same issue and how they fixed it, hoping it could help me too. Nothing I found seemed to be anything close to the issues I'm having, or the people aren't using DTS so its unhelpful.

Am I doing something wrong? Did I not set up my PC properly? Or is this DTS program I've never even heard of before the problem? If so, how do I fix it?