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...when I downloaded was greeted with these two beauties.
Did you download via camera cable, WiFi, or pulled the card and used a card reader?
Used the computer's onboard card reader.
The most likely suspect, as mentioned above, is the card reader, followed by the card.
If you put the card back in the camera and try to download the file via cable, and the file still looks scrambled, then that'll indicate either a card problem or, less likely, a camera problem.
If a cable download has no problems, then it's almost certainly the card reader.