How can I mute the mic input during recording audio

I am trying to record what I hear from my speakers, but when I record I am also hearing ambient sound through my laptop mic.
Also I notice that the "Playback device " is set to Speakers/Headphones Realtek Audio and it is picking up input from my Mic on my headset. So I disconnected the headset/mic cables but it is still picking up from the laptop built in mic.
I only want to capture what is coming out of the speakers.
I am running Windows 10 on an Alienware 17 laptop.