Hewlett Packard Envy M6 laptop HyperV problem with WIFI (re-visited)

I tried again last week, and turned off WiFi and then tried turning back on HyperV. Blue screen again.
Fortunately my USB hard drive was lying nearby and I plugged that in as a recovery device. It isn't, but the shock of having to deal with this lie forced Windows 8.1 into offering me a true reboot instead of a 're-fresh' and I rebooted into ROM and I was able to turn off Hyper-V there and boot into Windows without having to re-install Windows from scratch again.