2012.04.20 01:47
DISABLE FROM BIOS: BEEP -> KEYBOARD BEEP
or
1. Open the Device Manager. You can do this from My Computer -> Properties -> Hardware -> Device Manager.
2. Show Hidden Devices. You can do this from View -> Show hidden devices. This is where I was stuck: I didn’t know the Device Manager had hidden devices.
3. Under Non-Plug and Play Drivers, open the properties for Beep. Go to Driver -> Stop, and the beeping will cease. I think you can also Disable the device, but for me, this would require a reboot.
http://www.intelliot.com/2006/12/thinkpad-keyboard-beeps-fixed/