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Are you using the same card that worked this morning....now?
Are you using 2 different cards?
What are the card types you are trying to view? SD? SDHC? XD? MMC?
I suggest pulling the card reader from the computer......and then doing a computer Restart.
Once the computer restarts and you are fully into the windows desktop.....plug the card reader back in, without the sdhc card inserted, then once the card reader is recognized, plug the sd card into the reader......let me know results.
okay bye now.