Realtek microphone automatically enabled when unwanted

Hi, the laptop i own is an Acer Aspire with Windows 7 and i have had it for about a year now. At first my microphone was perfectly fine and about 6months ago i realized that when my internet pages were loading my microphone would automatically turn on. Also when i watch Youtube videos or other types of videos it also activates itself. Yes, I have tried to right click on the sound button and I have disabled my microphone. Sadly the problem is still there. I'm not sure what the problem could be when it says my microphone is disable but somehow it still activates when i watch videos or my internet pages are loading. Is there a way to fix this problem or a way to disable compleatly my microphone without disableing my Realtek Speakers?
Thank-you!
 
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