1.
Double click on the Speaker icon in your system tray/taskbar. When
the "Volume Control" window opens, make sure that none of the options
are muted. If Microphone "Mute" option is checked, that's okay.
It is intentionally muted so that you don't hear the "whistling"
feedback through your speakers.

2.
In the Volume Control window, select: Options > Properties.
Make sure to select "Recording" button. Now click OK.
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3.
On the "Recording Control" screen, make sure that "Microphone"
or "Recording" levels (or both) are set higher (preferably
above 75% of max), and make sure that the Microphone "Select"
box is checked. Close the window and try to place a call.
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3.
Make sure no other audio programs are using your sound card.
4.
If after going through steps 1-3 you still do not see an improvement,
reinstall your sound card drivers and then repeat steps 1-3 above.
(To ensure correct installation of your full-duplex sound card drivers,
consult the owner's manual or the technical support of your computer
manufacturer.)