The answer is this:
Somewhere along the path of communications between the motherboard and Windows is a miscommunication about the device type/controller of the memory card reader. One is misidentifying the device and causing an error in the other.
Tonight I'll test out the memory card reader on the same hardware, but with Ubuntu booted instead of Windows. I'm going to guess that the card works fine in Ubuntu. I'll be sure to up date this post later with outcome.