I installed MSN and everything is working

Only when I want to make a video call I have no sound

I checked the microfone and it is working, I tested in MSN and there is movement in the soundbar

I tested with another micem, same result

I tryed with Skype, no problem

All other programs working with mice are working fine

I repaired windows essentials, no solucion

Checked a lot of websites and found a lot of people with this problem

What is the solution?

(using only Skype on this moment)