Make sure the mic is the default communication device. Heck it can also be the default for everything.
Right click the little speaker(near the clock) and select Recording Devices. Then make sure mic is set to default communication device or even that and set as default device if you do not use any other device plugged into the system.
Still can not hear,? Try to up the volume, but this should have already been done when you ran the setup a microphone option, but you can double click on the mic in recording settings and check under levels