[Solved] VT-x is not available (VERR_VMX_NO_VMX)

[UdoJ]

Hi there

get this error since a few days. Was working fine since weeks. Think it has to do with another update on Insider builds.
I'm running on

Windows 10 Enterprise
Version 1809
Build 18252.1000

I checked that Hyper-V is still deactivated/uninstalled and tried the

dism.exe /Online /Disable-Feature:Microsoft-Hyper-V

command, rebooted but still the same.

I also repaired the installation.

Help is highly appreciated.

Thanks and best
Udo

[mpack]

There isn't much room for doubt there. Either Hyper-v or one of the security features based on Hyper-v has been enabled by the update.

Related FAQ: I have a 64bit host, but can't install 64bit guests.

[UdoJ]

Hi there

Thanks for fast reply. I did another test: creating a new machine it just showed me 32-bit versions available - what?? So I configured a Linux Ubuntu 32bit one and started it with the image. I got the message "Raw-mode is unavailable courtesy of Hyper-V" - ok, so some more HyperV stuff is still active as you mentioned. I searched for and found that one I CANNOT POST URLS

Solution:
STEP 1:
Open the command prompt as an Administrator.

STEP 2:
Run the command with no argument: bcdedit

After you run the above command, you will see that the property hypervisorlaunchtype is set Auto by default.

STEP 3:
Disable Hyper-V by running the command: bcdedit /set hypervisorlaunchtype off

STEP 4:
Restart your PC system to use VirtualBox.

With me the auto launch type was still on auto, I deactivated, rebootet et voila - VirtualBox is running fine again, also offers me to create 64-bit versions again

Best
Udo

[mpack]

I imagine that a common mistake is to confuse stopping a program with disabling a program. In the former case it will simply start up again on next boot.

Thanks for reporting back.

[bmichalski]

Quick addendum in case any one else gets here with the same problem. If the above solution does not work; please check the thread titled: "I have a 64bit host, but can't install 64bit guests"
(Sorry, can't post direct links yet as I just created my account to write this).

If you are running Windows 10 and enabled core isolation without thinking, like me, you'll find yourself running around mad..

Great work @mpack !!! Thanks for the help

[mpack]

Hmm. That's the FAQ that my first reply should have pointed to, instead I accidentally pointed to the other most needed FAQ. Don't worry future readers: I just corrected it for you.