Ha, fun. I just got around to looking at this again, and when I go into the device manager, find the device, and click on "Driver Details," it tells me "No driver files are required or have been loaded for this device." Ha!
So, while technically true (since the gamepad is recognized and is sending signals to the PC), it looks like Windows handles these kinds of pads however it wants. Granted, it could be the pad its self, but like I said, I could have sworn I used it before...
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Matt