Sometimes you can get “VT-x is not available. (VERR_VMX_NO_VMX)” error if you are trying to start x64 bit virtual machine in VirtualBox.
There are three most common reasons for this error:
- Your CPU doesn’t support VT-x or AMD-V virtualization
- VT-x or AMD-V is not enabled in BIOS (UEFI)
- You have Hyper-V virtualization enabled in Windows
You can fix first one only by replacing CPU with a new one, but it is easy to fix second and third reasons.
Solution 1: Enable VT-x in BIOS
- Restart your computer
- Load into BIOS (press Del, F2, Esc key. Depends on motherboard)
- Find Virtualization setting and enabled it. It might look different in you system, but here are some examples:
Solution 2: Disable Hyper-V virtualization
Run cmd.exe as Administrator
Execute:1
dism.exe /Online /Disable-Feature:Microsoft-Hyper-V
Reboot computer
Another way:
- Open Control Panel
- Go to Program section -> Turn Windows features on or off
- Disable Hyper-V