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OV7670 without FIFO very simple framecapture with Arduino, black/white
Even I faced the same problem. Solution:Goto ControlPanel>DeviceManager.In the tool bar,go to "View" and check the "Show hidden devices" option.Now you must be able to see all the devices which are using your COMs. Just right-click on them and uninstall that which you aren't using.This worked for me!