Firstly, navigate to Start, type dxdiag and open the utility. Click the Sound tab, check your audio card model and download and install the latest drivers available from the developer's web page. After that, right-click the sound icon from system tray and select Playback devices. Right-click anywhere in the opened window and check the Show disabled devices option. Select the audio device, click the Set default option and then press Properties. Select Use this device (enable) as Device usage, click Apply and then OK. If you still have issues, make sure you plug the headset correctly to your computer.