Can You Oovoo Without A Microphone Webcam Problem Help?!?

Webcam Problem Help?!? - can you oovoo without a microphone

At Christmas, I have a Dell Inspiron with a built-in webcam. Then create an account ooVoo. I chat with friends, and all good, but its special characteristics that can not be accessed. What can I use when I make videos or pictures break, but not while I'm in the chat. I know that you can use it, because my friends use it without any problems. You know, if I configure should be something else? Thank you.