This is usually caused by two applications trying to stream video at the same time. To solve this, do the following:
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Left-click on the LWS icon on the taskbar (shown below) to check to see if the Quick Capture application is running:
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If Quick Capture is running, close the Logitech Webcam Software by clicking the X in the top right-hand corner as shown below:
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Launch your video chat software (Skype, AIM, Yahoo, etc), and try to video chat to see if you still get this error. If so, proceed to Step 4.
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Check your computer documentation to see if you have a third-party device such as a TV capture card that might be streaming video. If so, disable these devices and check your chat client again.
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You should now be able to stream video chat without receiving the 'Camera in use by another application' error message.
Additional Information:
If the above solutions do not resolve your problem, consult Knowledge Base article 12568 for instructions on contacting Logitech Technical Support.