It's getting a bit over my head now, Sian, and I/O errors are not my bag, but it does seem as though the computer is having trouble reading from the camera (or the camera memory card). Oh, just a thought, do you have another memory card you could try in the camera? Just wondering if it might be a dodgy card? Failing that, I think the next step is to somehow try the camera with another computer, and if it doesn't work, it more or less proves a fault with either the camera or the memory card.