Turn Off all System Beeps

--> Select Start

--> Go to "run"

--> Type as regedit

--> Select "HKEY_CURRENT_USER"

--> Go to "Control panel" option

--> Go to "Sound" option

--> Now select "BEEP" option which is in right side

--> Now enter the value data column as "No"

Now all your system beebs are turned off