These commands assume administrative rights on the PC.
To temporarily disable the PC Speaker beep:
net stop beep
To disable the PC Speaker beep for good (until you undo this setting):
sc config beep start= disabled
So, if you are bothered right now by PC Speaker beeps and want them to go away even after a reboot, run net stop beep and then run sc config beep start= disabled.
The space between start= and disabled is required.
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