Ok, I was able to get it working. I ended up uninstalling the adapter in Device Manager (and removing the drivers), then rebooting, then attaching a USB wifi adapter and updating to the latest driver. Incidentally, the Intel Driver Utility didn't work. It identified my compute stick, but the installed drivers and latest drivers lists were both empty. I had to download all the packs and install them manually.
But at least it's working again.