webcam and netmeeting

[Marc LEVRIER]

Hello,
I have a quickcam who is connected to USB.
I have a video card DVI with a flat screen DVI.
When I connect my webcam to the internet by netmeeting,
the person that I am calling has no image from me.
I see him.
I have no firewall.
My driver is update and ok.
Help me!
Thanks for all
Marc