compact flash problem

i recorded a video on my canon 1S and instead of ending the video the proper way i shut off the camera itself. When i go into photo review mode i can watch the video with no problems but when i try to download it to the computer i get tons of errors and it will just force me to cancel. is there any way to get that video on my computer? (btw i dont have a CF reader i just plug the camera into the usb itself)