Bootcamp running Windows 8.1 does not recognize the USB-C adaptor on my Macbook 12"

Yes, in the Device Manager, I see a yellow triangle and exclamation mark as soon as I plug in the USB-C adapter, whether I have my iPhone plugged into the adapter or not. I tried uninstalling the "unknown device" but as soon as I plug the adapter back into the USB-C, the unknown device comes back.

Step 1 didn't work. Device manager still shows error after rebooting with device plugged in.

Step 2...You mean the bootcamp folder in the Programs Files folder in Windows? Should I copy it or move it? In any case, it does not have a setup.exe in it...only a Bootcamp.exe (which appears to do nothing when I double click it) and a folder Boot Camp.Resources. Sorry for the stupid questions...I really appreciate your help.

OK...I figure out what you mean by Step 2. I downloaded the bootcamp files to a USB drive with bootcamp assistant on the Mac, then copied them to the Windows partition and ran setup.exe. It appeared to have reinstall the divers, but, after a reboot, the same problem occurred. See below:

Somehow this thread got marked "solved". It is not solved. Any ideas? Does anybody have these adapters working without an error?

Uninstalling and scanning for hardware changes just replaced the unknown device in the device manager, Here is what it looks like in the Events tab.

This makes no sense to me that replacing the driver didn't work. Could the adapter be defective?

No luck. I tried uninstalling the "unknown device" driver and also the other USB drivers, then running setup.exe, both with the adapter in and with it out. When it was in, I actually got the error message "USB device not recognized" while setup.exe was still running. When the adapter was out, I got the error as soon as I put it in (after rebooting). Not that nothing is actually plugged into the adaptor.

Do you know what this "unknown device" driver is for? The USB 3 port seems to be working using the generic USB hub and generic superspeed USB hub (which both say the device is working properly). Is it for the USB-C? For the VGA? My only signs that the system is not right is the error message saying "USB device not recognized", the "unknown device" error in the device manager, and the fact that my iPhone won't tether with a USB cable (I can still tether with WiFi).

Is there a way to find out the name of the driver it is looking for?

I tried both by USB-C VGA Multiport Adapter and my USB-C Digital AV Multiport Adapter, both have exactly the same problem: Windows reports "USB device not recognized" and the device manager shows an unknown device with error code 43. That rules out a hardware problem with the adapter. Is anybody NOT having this problem with their MacBook 12 running bootcamp (Windows 8.1)? I suspect that Apple just didn't provide the Windows driver with bootcamp on the new MacBook (the same thing that happened with the Bluetooth driver).