What makes you think you can do what you want - or are you just hoping? I do not think it is possible - but need to verify by reading through the manual. What are you trying to "record" on the PC? Just because something is connected to the PC does not mean the video/monitor information is sent though all ports - in this case, the USB port.

What happens if you just point the video camera at the computer monitor and viddeo tape whatever it is on the screen you want to record?