Gaming Nikon Camera Problem - SD Card

[Hakoda]

Hey there Tempers, I have a rather old Nikon Coolpix L5. I have a SanDisk Ultra II 2GB SD Card. Each time I open the card via built card reader on my cousin's computer (on vacation) and cut/copy pictures somewhere, it will tell me on the camera when I scroll back through, "File contains no image data". Although I can open the pics on the computer just fine. Should I just forget it and ignore it? I've tried reformatting with the Panasonic Formatter and pasting the photos back but the same thing happens. Could it be the card reader? Should I use his printer SD port instead?