To fix this problem, I suggest that you first uninstall your Dell Webcam Central. You can do this from Start > Control Panel > Add or Remove Programs (Windows XP) or Programs and Features (Windows 7), select the program and hit Uninstall. After you do this, try going to the following support website, search for your product, and download the latest webcam driver for it. After you installed the driver, visit the following website and download the latest version of Dell Webcam Central. Also, on the site mentioned, you can find more about the known problems of this application.