Same prob, using control panel sound mic off does not work

Right click on the speaker in the bottom corner (or go to sound in the control panel) and go to playback devices. Then click speakers, then click properties. Go to the levels tab and mute/lower the volume of the microphones.

Open volume control.

When th box with all the sliders opens up click on OPTIONS (top left)

Click PROERTIES

Tick RECORDING then clck OK

The slider box will swap to the RECORDING slider box

Select the one you want to use as the recording SOURCE and put a tick in the box at the bottom.

You can also set the recording level here too.

Now click OPTIONS once again

Then PROPERTIES

Now tick PLAYBACK and then OK

You should now be back in the normal playback slider box

Whilst you were in the properties for either recordeing or playback you may have noticed a list of devices to show then as sliders tick them.