Windows 7: Logitech quickcam stx microphone problem

Hi, the problem is simple

The microphone is not working at 100%

Some time he work ( but rarerly )

Some time, need to do a new setup in msn

and the microphone doesnot work if im not in headphone mod

Some time, the game like Alien versus predator, Call of duty:modern warfare

doesnot recognize the microphone but all working but need to do new setup..@ IN WINDOWS @

Who got idea to fix this ?

I think i will call logitech support...