Is it a Windows filing format?
Right click and then hit properties to check if the folder is write protected.
Other than that, try scan disk, defrag, or run any utilities that came with the drive.
Try creating another folder with the same name and see what happens.
Try removing any files from the folder first. Then delete the empty folder.
Run a virus scan.
Buy another of the drives from Best Buy. Copy everthing to the new drive an return the old drive in place of the new one.

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