Hi. I'm David, and I'm happy to help you.
From what I understand, your headset has a single P3 jack plug (three black or white lines), correct?
Usually, the Realtek audio driver comes with the Realtek Audio Manager or Realtek Audio Console, which is hidden in the system tray.
Open the Realtek Audio Manager/Console and look for your computer's connector settings. With the headset connected, click on the connector for the headset and specify that you have a headset connected.
Feel free to ask back any questions.