To be sure your microphone is connected and recording sound go to the Control Panel (click the start button and type “control” in the Search box and press Enter).
On the Recording tab of the Sound dialog box be sure the microphone you want to use is selected as the default microphone. If it is not, right-click it and choose “Set as Default Device.” If you do not see it listed among the Recording devices right click the dialog box and choose “Show Disabled Devices” and “Show Disconnected Devices” are both selected. If your mic was disabled be sure it is connected to the computer correctly and is enabled.
Speak into your mic to be sure it is working. You will see an audio level meter activate as and begin to register sound as you speak.
If you need to adjust audio levels, click the Properties button, click Levels, and adjust.