Xbox live vision webcam help

>I recently tried using my xbox live cam with my computer; It's usb and is
> capable for being used with windows xp (which i have). But i cannot get it
> to
> work at all. when i try to test it in My Computer I get a pop up that says
> :
>
> Creation of the video preview failed.
>
> Please check the device connection and make sure the deivce is not being
> used by another application or user.
>
> The cam is connected and is not being used by any other program,when i log
> on windows messanger it detects the camera but when i try and use it on
> the
> messanger i also get a error saying the webcam is not plugged in or is
> being
> used by annother application. I am not using the camera with anything
> else
> though.
> the drivers are installed and in Device Manager/Imaging devices it says
> the
> cam is working properly. I've tried using it with yahoo messanger and i
> get
> the same error message. I've searched for an answer and couldnt find one
> so
> hopefully someone here will know how to fix this problem. Or if theres a
> way
> to find out what device is using the cam?
>
>
> -thanks for your time