Default [Q] Trying to unlock bootloader, windows 8.1 will not recognize device

Hi! I'm having some issues trying to unlock my bootloader so I can root my new one mini.

I've been trying to follow the instructions here: http://www.htcdev.com/bootloader/unlock-instructions/
But when I get to step five, fastboot won't detect the phone. adb can't see the phone either. My computer cannot recognize the device

I have sync killed on my computer, I've tried both USB 2.0 and 3.0 ports, and I know my USB driver is up to date.


Something with my computer's OS or drivers is not working, and I can't figure out how to progress. Can anyone help?