Right click on the speaker picture and choose "Recording devices". Look if the computer recognizes your microphone (Should be a "Line in" connected device as it is 3.5 mm jack.) If it does, right click on the "Line In" and mark it as default. Then check if your microphone records the voice.
If your "Line in" says that the device is "disconnected"or "Not plugged in" then I am out of ideas for now. Trying to google some more info.