Echo on recording [SOLVED]

Hi I have read the previous posting about this but it does’nt answer my question. I am trying to record a radio broadcast using Audacity 2.0.5 on Windows 7 Home Premium edition. I have plugged a jack from the radio into the microphone socket of the Acer Aspire 5532 laptop. When I press record I get a duplicate/ echo sound so that I hear the broadcast and the recording .Fortunately it doesn’t seem to come out on the recording but is fruatration when listening. Please tell me how to solve this. What setting on the recording or playback devices should I change?

Look in the Transport menu and ensure that “Software Playthrough” is OFF (not selected).

Thank you very much Steve. Done.