Right click the little icon of a speaker in the task bar --> select "recording devices."
Highlight your microphone in the list by left clicking on it --> click "set default," then click the properties button in the bottom right.
Go to the "listen" tab --> check off the box that says "listen to this device" --> click apply. Leave the drop down menu set to default.
Plug in an audio cord to the headphone jack. Hook the other end into your stereo or speaker. Done.