There is no need to dodownload something. assuming that you have already installed correctly the audio card drivers. If you are able to hear sounds from the speakers, the audio card is installed correctly. So plug the green male jack to the green female jack and the red male one at the red female jack (if your headset has no mic, is only headphones, there isn't any red jack). From now on you must be able to hear sounds from the headphones and talk to the mic for someone to listen.

In case of a problem or clarification, don't hesitate to post.

Thanks and regards
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Stelios