NIS 2011 and Windows Live Messenger

Hi!

I've a new Compaq laptop, and impossible when using WLM to have any sound working... video is fine. I uninstalled Live Essentials, I uninstalled NIS, reinstall everything and still the same pb. I check all the sound, the mike, the speakers, the mixer: everything is on, NO mute, and it's working with WMP and other applications...  I am told by several sources that the pb is NIS 2011.

Could you help me ?

Thank you,