virtualbox.org

Fact: I recently changed my PC hardware (except OS MS Windows10 Pro x64 (no new installation), files and graphics card), I changed my Intel processor to AMD.
Action I performed: I checked in the bios if the SVM mode is activated. I also uninstalled Hyper-V which I used to use as a hypervisor.
Frequency of issue: This issue affects all VMs created before I changed my hardware and some newly created VMs.

I use VirtualBox 6.1.18

Attached is the log and a screenshot of the last VM I created and tried to launch.

Thanks in advance for your help,
Equinox

00:00:02.686166 HM: HMR3Init: Attempting fall back to NEM: AMD-V is not available
00:00:02.721153 NEM: WHvCapabilityCodeHypervisorPresent is TRUE, so this might work...

HMR3Init: Attempting fall back to NEM (Hyper-V is active)

Thank-you for your help.

I disabled :
DeviceGuard
CredentialGuard
Windows Defender's Core Isolation

And run both commands in terminal:
bcdedit /set hypervisorlaunchtype off
DISM /Online /Disable-Feature:Microsoft-Hyper-V

Then shutdown and after restart.

And it works now.

Thanks again.

Thanks for reporting back.