Laptop webcam not working - help!

I’ve been running a Dell Inspiron 15, and I’m running into a bit of a headache with the built-in webcam specifically when I try to jump on Skype. I don't really use the camera for much else—it's mostly just for calls—but lately, it's been acting up. I actually installed Skype about a week ago, and everything was working perfectly on day one; however, by the second time I tried to use it, the camera just stopped responding. Now, whenever I head into the Skype settings to check things out, I just get this "no device found" error message.

Does anyone happen to know what might be causing this kind of glitch?