Windows driver issue

Uninstall windows driver and reinstall following this steps:

Control Panel -> Device Manager
Expand "Universal Serial Bus controllers"
Most likely you will have one or more "USB Composite Device"
Right click -> Properties each "USB Composite Device" listed and note its "Location", each has a unique location.
Plug in CC3D, do not launch GCS.
You now have one new "USB Composite Device", Identity which one is the new one by Right click -> Properties
Uninstall this new "USB Composite Device" ie your CC3D by Right click -> Uninstall
Unplug CC3D from USB Port
Sometimes Windows need a reboot at this step.
Plug in CC3D and let windows reinstall driver. You'll hear the Windows Device Discovery tones indicating the device is successfully installed.
Launch GCS, all should be good now.

USB Composite Device

You need to uninstall the USB Composite Device, uninstalling the Virtual Com Port has no effect because this is not used by default.

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