Although we don't recommend this tip very much as having the warning beep etc can help you find out when problems happen, some people do get annoyed by it - We have a simple registry editing way of turning them off.
Load Regedit.
Navigate to HKEY_CURRENT_USER\Control Panel\Sound
On the left hand side of the screen find Beep on the list.
Right click on it and select Modify
Change the value equal to no
Reboot your computer
The beeps will then vanish - if you wish them to return change the equal value back to yes.
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