OK. Did the headset come with any software? If not try this:
Q: While using my headset with boom microphone, why do I hear myself echo in my headset?
A: This normally occurs when the microphone is not muted in the playback volume controls. Use the following steps the resolve the problem.
Double click on the speaker icon in the System Tray to open the Volume Control.
Look for Microphone balance and volume slider. If you do not see it, click on the Options button, then click "Properties."
Ensure that "Playback" is selected in the "Adjust volume for" box.
Scroll through the volume controls list and place a checkmark in the box for Microphone.
Click "OK."
Place a checkmark in the box below Microphone, if it is marked "Mute." If the Microphone is marked "Select," uncheck the box below Microphone.
Click "OK."