If you're device is a USB webcam, try to run the Fix It utility provided by Microsoft. If it doesn't help, go to Start > Control Panel > Hardware and Sound > Device Manager, right-click on the webcam devices and select Uninstall. After that, reboot your computer, right-click on the drivers from Device Manager > Imaging Devices and select Update Driver Software. Use the Browse option to navigate to the installation package and install the driver following the provided instructions. Restart your computer, and the problem should be solved.