@upsidedowncreature said:
Maybe they've got a Dell laptop? Those things have got the loudest beeps I've ever heard, and they're not willing to be silenced.
In Device Manager, go to View and choose Show Hidden Devices (or something like that). In the right hand pane (where the devices are shown) there is a branch for Hidden Devices. Find the Beep device and disable it. Laptop is now quiet.