What model card reader did you buy at Walmart?
Besides the good recommendations of lower card size and formatting, I recommend that you format that card within the camera using the camera options.
I'm also thinking it could be lack of power getting to the card reader. If you're using a USB port, often the USB port provides insufficient power to a card reader and sometimes an auxiliary source of power is required. (also plugging it into AC)
Exactly what card reader did you buy? You said Scandisk, think you meant "Sandisk"? What model?
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