Hi,
- Did you make any changes on the computer prior to the issue?
- What is the make and model of the computer?
- What is the make and model number of the keyboard?
- Is the issue confined with any particular application?
You may try these steps to disable the keyboard sounds and check.
a. Click "Start."
b. Click "Control Panel."
c. Click the "Sounds" tab.
d. Click on the listing for the sound that currently plays when an action is performed on your keyboard. This will select it. Click the drop down menu on screen and select "None." Click "Apply" to disable the keyboard sound.
Also refer the link for more help
Change the sound scheme
http://windows.microsoft.com/en-US/windows7/Change-computer-sounds