Whenever i open the cam a4tech 635k it always say creation of the video preview failed. please check the device connection and make sure it is not use by another application or user.. what should i do?
Check if their is any program that are using your camera. closed any open program that related to your camera.
or try uninstall the software of your camera be sure you have to restart the pc after uninstalling, and install it again your camera sofware and driver.
Testimonial: "tnx for the help..it reli helps a lot.. i just re install it and it is ok now after i restart the pc.. God bless!"
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