Is a plug in card reader different to the card reader slot in a laptop? I used a Lexar SDHC 4GB card which I got cheap when I bought my point+shoot Kodak. I have had problems with the card before - the laptop doesn't read it unless it is in the camera. I have a plug in card reader somewhere - I will sort it out and try that - it would be easier than plugging the camera in.
I did format the card in the Nikon before I used it. I'll also try one of my smaller memory SD cards.
Thanks for the advice Big Bill