Logitech headsets integrate a microphone and headphones in one unit to comfortably improve communication or dictation. If the headphones do not work after installation, they may be disabled in Windows 7 or not selected as the default device. This might not be an issue with 3.5mm connections that plug into your sound card and become automatically enabled, but wireless or USB connections make the Logitech headset a separate device that Windows must be configured to use.