If the Internet browser you can not hear the audio (web radio, youtube, media, etc.) the problem can be solved simply by changing the registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32
which must have the key wavemapper and within the value msacm32.drv

Update: The answer given solves to the problem even if you do not hear the sounds of the various operations in the operating system