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Good points about rebooting on the Mac, and removing the USB devices on Windows and allowing it to recreate them.
This is needed on PCs because something can hang up in the USB drivers, and in the case of the Mac what happens is that the Auto-Mounter gets confused and leaves the mount point occupied, then can't re-mount the device until you re-boot to recycle everything and reset and clear out all the removable device mounts.
Another point that shroud be made clear it that a re-boot must include a full power shut down and system re-load to be effective. Not 'sleep', or 'hibernate', or 'suspend' - A FULL POWER OFF, PLUS FULL SYSTEM RE-START.
The original poster mentioned already trying a re-boot, which was why I suggested trying another cable and USB port.
Another trick is to change to a USB1 port if one is available - or change the mode of the existing port to USB1 in the PC's BIOS if that is possible.
USB2 Devices like the Sony Readers are required to be backward compatible with USB1, and although USB1 is a bit slower for large files like MP3 audio books, it should be fine for transferring PDF, EPUB, and LRF ebook files, and can be more stable on some machines.
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