Hmm. I dug up a USB 2.0 hub and plugged the MK1000 into that. No change in behavior on either end. Nothing happens when I plug it in, or when I unplug it. Nothing ever appears or disappears in the Device Manager. When I try to force an installation with hdwwiz.exe, I have four possible drivers to choose from:
MKR1000 version 1.1.0.0
MKR1000 version 1.2.3.0
MKR1000 bootloader version 1.1.0.0
MKR1000 bootloader version 1.2.3.0
All four produce the same result: "The software for this device is now installed, but may not work correctly. This device cannot start. (code 10)" This result is exactly the same whether the MKR1000 is plugged in when I run the wizard. I can install multiple instances, and get multiple nonfunctional COM ports under Device Manager.
If I force it to use the drivers directly from the "drivers" directory, I get the same result. If I force it to look in the FTDI USB Drivers directory (as some posts have suggested), then it won't proceed at all.
I'm really hoping someone has an idea about this.