The computer uses a small program to be able to upload pictures from the memory card once the pictures are safely on the computer hard drive hopefully you created a file folder for them then the memory card needs to be formatted in the camera. Formatting the memory card cleans the card and makes it compatible to the camera again. Every time you download images to the computer the memory needs formatting in the camera. Any new memory card needs formatting in the camera a card that has been formatted in the computer needs to be reformatted in the camera. Also please be aware that there is a protection lock on the side of the SD card and if placed in the incorrect orientation will actually lock the card from formatting or deleting files on the card. I'm going to include a diagram here to show you where this little switch need to be for the "unlock" position.
Switch needs to be towards the top of the card in the direction of the gold contacts
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Did you modify the pictures at all while using the SD card in your laptop? Even something as small as rotating the pictures so they are right-side up?
In the future, drag and drop all photos into a directory on your laptop to copy them and leave the ones on the SD card alone.
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