Thank you for your quick answer
But i tried all that you said before and it didn't work xD.
In fact the sound works, i can listen to music and everything (so do my headphones) But my mic won't work oO i thought it was broken, but it worked on an other pc.
and for my system, i tried everything: in the control panel or in Realtek manager and this won't work oO and i tried the "separate input jacks" too.
I had same type of problems with vista before but they've been solved by installing the newest Realtek codecs.