you need to re-install your webcam driver.
-first uninstall the web cam driver you are currently using to do this follow these steps:
-go to start, control panel, programs and features then look for the driver of your cam, click un-install).
-restart machine
-download the driver of your webcam from
www.lenovo.com/support. type in on the search bar Y510 drivers then look for the webcam driver
-install webcam driver and test it
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