People can hear themselves when talking on Skype because of my headset

[Daner]

Heres the problem: When my friend talks to me he can hear himself. Im pretty sure its something in the sound settings but i dont know what it is. I tried the Skype Live! too and all people can hear themselve because of my mic

 

[Tmagic650]

Try a friend's headset and see if you still have trouble