Webcam won't work..

My webcamera won't work.. I have a built in webcam and just hooked up another webcam in my USB port. I go onto My computer, but it isn't there ??? . I also have windows 7Anyone know what is going on? Is there any other way I can film pokemon battles from my DS?

If you get Manycam you can set the input to come from your computer screen instead of the webcam, and then you can play Pokemon on an emulator. Other than that, I don't know.