I suggest you double check that you have the correct drivers installed but it looks like your board might be bad 
One thing to try is to try using the rescue button within librepilot to try recover the board. But if its not being recognised by your PC it means its not even starting up correctly so might not be possible.
Did you buy the CC3D from us? If so send support an email and we should be able to replace it for you if its still within the warranty period.