Problem setting up mic

I have windows 7 starter. I have Realtek High Definition Audio. When I try to set it up my Mic and messed up. Now it does not show I have the ability to set up mic. It erased my mic abilities. How can I change this? All I did is put it to disable mic. Now it will not allow to enable it. Because when I unplug the mic/headset it screached through my speaker.
 
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