I think you are missing a step or pushing the wrong power button.
The sequence should go like this first make sure the batteries are up to power if there is an interruption the pictures could become lost and corrupt the memory card.
Turn the camera off, connect the USB cable to the computer USB port not a hub or keyboard port.
to turn the camera on Fine Pix Viewer will start and the save Image Wizard will display follow on screen instructions to download pictures.
To disconnect make sure the indicator lamp is off then press the same button for about a second to shut the camera off THEN disconnect the camera from the computer.
You should then format the memory card to begin fresh with a clean card and allow the camera and memory card to properly communicate between each other without errors.
Here is a diagram to show you were and how to format the card.
Diagram
Have fun with your camera
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