Try right clicking on the little speaker in the Windows task bar located in the lower right corner of the display. Select the "Adjust Audio Properties" option.
Select the "Audio" tab from the dialog box that opens.
In the "Sound Recording" section (in the middle of the dialog box), press the "Volume" button.
Make sure "Microphone" is listed as one of the recording devices. If it is not listed, then select "Options" and "Properties" from the drop down list. In this section you will need to put a check mark next to "Microphone". Once you do this, then hit "Okay".
Make sure you have "Microphone" selected as the recording device. (In the Microphone section at the bottom, is a "Select" checkbox. Make sure it is checked).
Now press the "Advanced" button and make sure the +20Db option is checked.
Also make sure the slider for the microphone is near the top for the best recording.
That should do it.
