If you changed anything, unchange it. Default settings will work. Go into your volume control and go Options>Properties, select "Recording" and make sure that "Microphone" is checked. When the control changes, check that "Mute" isn't checked. Also, click "Advanced," check the Mic Boost box if it isn't checked. On some SoundBlaster cards, the mic boost shuts itself off. Uncheck the box, hit OK, and recheck it to be sure.