Fastboot won't run in Windows 10 Anniversary 64 bit

I have used adb and fastboot for a long time, and this is the first time I've had a problem. I updated to the August security update on the first with no problem, and my computer updated to Windows 10 Anniversary 64 bit on the second. I can do "adb reboot bootloader" and it works, but any fastboot command, even "fastboot devices" does nothing.

Windows Device Manager shows an exclamation mark for "Fastboot Shamu S". I have looked for hidden devices and uninstalled the driver. I tried to...

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