|The memory card containing the photos could be corrupted and in need of replacement, or there could be a communication problem between the camera and your computer.|
You might have better luck if you bought a card reader instead of using proprietary software to transfer your pics. With a card reader you don't need to connect your camera to the computer at all, so that eliminates any communication problems between the two.
You just connect the card reader to your computer, remove memory card from camera and insert it in to the correct slot on the card reader.
If still you get an error, the pics are most likely corrupted, which is caused by the memory card becoming faulty and no longer usable. They don't last indefinitely & can fail without any warning, but of course I hope that isn't the case and that using a card reader is successful.