No audio ! no sound ! please help !
 

I have come acrossed with a strange problem like a nightmare to me .I have no audio , no sound on my htc touch hd since last night .no audio for any media file or any sound and notifications ! unable to make a call ( it connects but there's no sound on any side ).
When receiving a call , it can vibrate but doesn't ring !
Last night I noticed that simultaneously both the front and back speakers have been quieten ! It's very annoying and drawes me nut .
-having done a dozen of soft resets.....
-have removed at least 10 recent applications with no success !
-had pluged in and unpluged the headphone also ,but no change .
The strange thing is that even tf3d player doesn't work ! But in other hand windows media player works , of course with no sound (not in speakers nor via ear phones ).
The main culprit , I think is sk tool .last night i used it's auto clean and move up functions and it check marked automaticly the box of (system/audio.exe) file . May be it has removed that file somewhere or have killed it ! Is it possible that missing this particular file is the root of the problem ? If so ,any hard reset will be ineffective too !
So ,what can i do ? And what's going on ?
Any ideas ?.....please help .