baumgrenze -
I have had the same problem, and you are NOT going to believe this, but I found the cause, and it's...
AVAST !!!
On my Win 8, where HAV says it works, I do NOT use Avast AV. I've been using Windows Defender.
On my Win 7, where HAV says it's not enabled, I use AVAST AV Free, and it's been at the new 2015 Avast for a while.
Over the past week, I've been thinking about this and wondering.
So today, I ran some experiments, and it's an AVAST default setting that is the villain.
Avast - Settings - Troubleshooting - "Enable hardware-assisted virtualization" has been on, so I turned it off, rebooted, and now the havdetectiontool shows "This computer is configured with hardware-assisted virtualization".
Great!!! But bloody hell !!!!
Can anyone tell me why Avast's internal setting to enable HAV takes HAV away from everything else? Avast has certainly been getting sleazy the last two years, so apparently they're also not quality-testing their new versions very well.
Any thoughts? Was this supposed to happen?