HP 255 LAPTOP (Windows 8) MICROPHONE CANNOT BE MUTED---NEED HELP A.S.A.P!!!

Question

Re: HP 255 microphone troubles.
Sorry! I typed "Windows XP" in the original heading, My bad!
NEED HELP IMMEDIATELY!!!
When I click on the Sound Icon in the lower right corner of the screen and select "Mixer" THERE IS NO MICROPHONE CONTROL!
I've gone into the Control Panel searching for it, typed "microphone" in the "Search" box at the upper right of the screen and...NOITHING!
THE MICROPHONE IS CAUSING A NASTY UNGROUNDED-LIKE SOUND WHICH IS QUITE LOUD.
I CANNOT RECORD VOICE OVERS (MY BREAD & BUTTER) WITH THIS INTERFERENCE! The internal microphone MUST BE MUTED/DISABLED OR DELETED!!
How do I go about doing this? I have deadlines to meet. This is a matter of utmost importance!
Your reply via Email would be appreciated greatly.
Thank You!,
VOArtist
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Answer 1

Try this:
Follow these steps to disable the built-in microphone.
a.     On the extreme right side of the Task Bar, right-click on the Speakers symbol and select Sounds.
b.     In the Recording Tab, right-click on the microphone and select Disable.
c.      Click on OK.
d.     If there is more than one, disable all.
Check if the issue is resolved.
If you want to enable the microphone, follow these steps:
a.     On the extreme right side of the Task Bar, right-click on the Speakers symbol and select Sounds.
b.     In the Recording Tab, right-click on empty space and select Show Disabled Devices.
c.      Right-click on the microphone and select Enable.
d.     Click on OK.