Nah that previous answer is BS...
Sound problems:
Check you've plugged in the grey end to the headset, it needs to go all the way in.
You can plug the black end in by mistake and get sketchy sound in one earphone.
Microphone problems
Check it's plugged in again (I know, lame!)
Check you haven't muted sound on the cable/dongle thing
Still no mic? It's probably windows "security"
Click Windows icon in bottom left.
Then click Settings icon second(third?) above bottom left.
Then click "Privacy" 'Location, camera'
Then halfway down on the left click microphone
Then turn, "Allow apps to access your microphone" to ON
OMFG - took me a week to figure this out.
Screw you Microsoft, you bunch of f'n c'ntz