Simple uninstall and reinstall your webcam drivers. Usually this should fix it.
Start->Type "device manager"->Imaging Devices->You should see your webcam here, uninstall it.
Reboot your computer, and your webcam drivers should be reinstalled automatically. If not, or if you want to try to get new drivers, then you'll need to go online and go to your laptop manufacturer's webpage, enter your laptop model number, and download the webcam driver there.
Or if you're not using a laptop, just lookup the webcam manufacturer's page and download the drivers from there.
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