Headphone listing is duplicated when using zoom.

I apologise if I am posting inappropriately, but I'm getting a bit desperate. I tried posting in the Zoom Forum, but kept being stopped with the message "Maximum flood limit reached" and I have no idea what that means! Anyway, this is the situation....

I recently got a new computer, (a Dell Inspiron Small Desktop 30305) and since then I have been freezing and crashing in zoom meetings. It starts with me getting a notice to the effect that my speakers aren't working (I wear headphones. But when I test them I get told they are working okay.) Then a bit later I can't hear what people are saying. Then later I freeze and crash.

When I look at the listing re my audio, this is the message I get (see below). It looks like my headphones are registered twice, and I am wondering if this might be causing the problems.

Listing in Zoom Audio tick box.

Select a microphone.

(tick) Headset Microphone (2-Microsoft Live Chat LX-3000)
Microphone (USB Audio device)
Same as System (Headset Microphone (2-Microsoft Live Chat LX-3000))

Select a speaker

(Tick) Headset Earphone (2-Microsoft Live Chat LX-3000)
Same as system (Headset Earphone (2-Microsoft Live Chat LX-3000))


I'm also not sure how to delete one of these double listings (if that is relevant.) I would be most grateful if anyone could give me some advice.