I answered this one before, I have a similar HD webcam... I am running Windows 7 (64-bit).
In Movie Edit Pro 17 Plus, after selecting the record button and choosing video recording (VHS cassette icon) for recording webcam I always received a "Could not connect to selected device". I use a Logitech C910.
I noticed that the audio driver selected was not the Logitech HD Pro Webcam C910 (WDM), and when I selected this, I was able to receive the video and audio correctly.