MW2 disables mic in-game

Okay, so this is weird...

As soon as I get in-game my mic disables, neither the in-game voice chat nor Skype works, so obviously my mic is disabled...

So any idea on how to fix this?

Ye i had this too, you have to bind the voice key to a letter,
cause numbers wont work for me either in game
only in the intermission

i hope i helped

Im using the default key, Z