Question : Showsound icon in notification area in Windows 7

i cant see sounds icon in notification area as usual.how to enable it again ?i tried to enable but got grey button as in the attached image, any idea to do that ?  

i have the recent driver installed.

Answer : Showsound icon in notification area in Windows 7

I see, then take a look at this

http://www.sevenforums.com/tutorials/19085-system-icons-enable-disable.html