Makes no sense to me.
You've exchanged the ereader device.
You've tried a new USB cable.
You've tried two computers.
When the device is plugged into the USB port, Windows USB driver sends a standard USB request to the Kobo device. It should respond with its name and device type (disk).
You should then see the next disk letter assigned to the Kobo and you should be able to examine its contents with Windows explorer.
I can't imagine USB drivers being bad on two computers.
I can't imagine your anti-virus software blocking the device, but maybe turn it off for a second and try it.
I just can't think what would be wrong.
ltr
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