Hi Brian,
What is the make and model of the computer?
Method 1:
I would suggest you to run the troubleshooter and check if it helps.
a) OpentheRecording Audio troubleshooterby clicking the **Start button,**and then clicking Control Panel.
b) In the search box, type troubleshooter, and then click Troubleshooting.
c) Under Hardware and Sound, click Troubleshoot audio recording.
Method 2:
If the persists, you may try connecting the headset to another computer as suggested by Basith M on September 12, 2013. Check if the issue occurs on other computer or not.
Refer to the link for additional information.
Record audio with Sound Recorder
http://windows.microsoft.com/en-IN/windows7/Record-audio-with-Sound-Recorder
Hope this information helps. Reply to the post with updated status of the issue to assist you further.