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Question: about my webcam

Hi, I have a ProBook 6455b. The webcam worked and then when I tried to use it the screen would only show black. So, I looked on forums and disabled it and then the imaging device also disappeared. So, then I tried to download the software and drivers and nothihg worked. This morning, it showed back up along with the Imaging Device. I turned it on this afternoon and the Webcam went back to a black screen. Then, I clicked on hardware update and the Imaging Device disappeard. Now I can't find it anywhere on my system. Please help. I use the cam for teaching.