Very limited input options

Just downloaded Audacity 2.0 and I have only two sound input options: Microsoft sound mapper (whatever that is) and my internal microphone. Since I used to use Audacity to record via my jack socket, this is not a great deal of use to me. How can I record via my line in socket, please?

Information about this forum
This forum is for Audacity 2.x on Windows.
For all help enquiries, please state which version of Windows you are using …

If you’re using Vista or Win 7, these operating systems often hide/disable “unused” inputs.
See here for how to “un-hide” them: