@plete ,
@cman4242 - getting a bit tangled up here but bear with me.
You are both sure that you have the correct audio drivers installed and that those drivers are up-to-date.
If not go to the audio card manufacturer's website and download the current drivers. Reinstall and reconfigure. Audio may just start working again.
@plete: It is good that the headsets work on your brother's pc.
Do other known working headsets work on your computer?
And your headsets have 1/8" (3.5mm) TRRS plugs correct? Any differences with or without the microphone being plugged in?
Be sure to test both the motherboard's audio ports and any sound card audio port if you have a sound card.
Inspect the host's audio ports (1/8" - 3.5mm) for signs of damage or internal debris. Try using the an audio extension cable between headset and audio port.
For example:
Headset ---> M plug -->] extension cable F port ------ extension cable-----> M plug ] host computer audio F port
You may find that a different incoming plug will restore proper connectivity between headsets and audio host.
Key is to work through the troubleshooting in a very methodical manner changing only one thing at a time.
Use a process of elimination. I.e., determine as
@plete did that the headsets work on another audio device.
Then doublecheck the audio hardware aspects on the host audio device as suggested above.
After that, focus on the audio configuration settings. Right click the small speaker icon usually found in the lower right hands screen corner. There are four menu options to work through. And those options have multiple windows, tabs, and properties as well.
Likewise, look through everything first. Be methodical and if you discover something that does not seem to be correct then make a change.
Change only one setting at a time and keep notes in case you need to "undo" something that caused some other problem(s).
Watch for error codes, pop-up windows. Read them carefully and note any error codes, numbers, or notifications.