Here are a few ideas to try:
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Try using the original micro SD cable that came with the player. Many $1-$5 store cables I have tried do not host a PC connection with my Clip Sport.
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Try ejecting the micro SD card before you connect your player to your PC.
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Try loading and managing the music files on your micro SD card by connecting to your PC via a micro SD adapter.
Maybe report back here with your status / progress ??