Monitor SP2309W mic problem after launching webcam

Hi,

I have bought that LCD monitor and have one problem. Start the SKYPE  call to my friend, talking, sound quality is very good mic works perfect, but after starting WEBCAM my friend hear too much noices trrrr brrrr krrrrr trrrr and so on.... if i stop video show the sound comes well again. I tryed to change USB, Drivers. Not hellped.

If i connect my old webcam, the sound is good, but if i connect that integrated webcam i have sound problem again.

I use Win XP proffesional

Help me what to do? The picture quality is amazing but this sound problem with webcam is killing me :(

Thank You