Enable VT-x

 

Problem

VirtualBox may run very slowly and show the “green turtle” indicator in the status bar.

The problem may be that VirtualBox cannot use hardware virtualisation because Windows or one of its services is already using it.

Solution

After trying many articles, this one really worked for me:

https://www.xda-developers.com/disable-hyper-v-windows-11/

In essence:

1. Command Prompt (admin mode):

• bcdedit /set hypervisorlaunchtype off

• dism /online /disable-feature /featurename:microsoft-hyper-v-all

2. Restart

3. PowerShell (administrator mode)

• get-netadapter|where-object {$_.interfacedescription -like "*hyper-v*"}|Disable-NetAdapter

4. Restart

5. Registry Editor

The following three features are meant to safeguard your PC from malware, so you should only disable them as a last resort if you continue to encounter the same errors in other hypervisors even after disabling Hyper-V.

• Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard
  
  • Create Key: EnableVirtualizationBasedSecurity   DWORD(32-Bit) Value
    • set value to 0 which is default
• Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
  
  • Create Key: LsaCfgFlags  DWORD(32-Bit) Value
    • set value to 0 which is default

• Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity

  • set value of Enabled to 0