Ticket #10694 (new defect)

Opened 22 months ago

Last modified 17 months ago

VirtualBox claims I do not have VT-x support.

Reported by: Inirit Owned by:
Priority: major Component: other
Version: VirtualBox 4.1.18 Keywords:
Cc: Guest type: Windows
Host type: Windows


I am receiving this error when trying to launch a Windows 8 64-bit VM for the first time:

VT-x/AMD-V hardware acceleration has been enabled, but is not operational. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.

Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your host computer.

It is claiming I do not have VT-x enabled, which I know for a fact that I do and that my hardware supports it.

Proof that my CPU supports it:

Proof that my BIOS settings are correct:

I've updated my BIOS to the most recent version and am using the most recent version of VirtualBox. I've searched for similar problems to mine and have only found a solution of disabling a "trusted execution" setting, but my processor does not even have that feature.


VBox.log Download (86.5 KB) - added by Inirit 22 months ago.
VBox.2.log Download (86.5 KB) - added by Inirit 22 months ago.

Change History

Changed 22 months ago by Inirit


comment:1 Changed 22 months ago by frank

Your log file clearly shows that VT-x was detected and is used by the VM. And it does not contain the error message. Wrong log file?

comment:2 Changed 22 months ago by Inirit

It's definitely the most up to date log file I have. I'll take another look.

Changed 22 months ago by Inirit


comment:3 Changed 22 months ago by Inirit

I just ran the VM, got the same error, and immediately looked at the timestamp of this log to make sure it corresponded to the same run.

comment:4 Changed 22 months ago by frank

Oh, your log shows VERR_VMX_IN_VMX_ROOT_MODE. Do you run Windows 7 on real hardware or inside some other VMM? Or do you have some other VMM running in parallel to VirtualBox? Do you run some WinXP compatibility application on your Windows 7 host?

comment:5 Changed 22 months ago by Inirit

I am running Windows 7 on real hardware. I only have VirtualBox installed. I had Virtual PC installed at some point before, but have removed it since by unapplying the Windows update. As far as I am aware I don't have any WinXP compatibility applications running.

comment:6 Changed 22 months ago by frank

But there must be some process which switched your host to VMX root mode, this is what the error message says.

Last edited 22 months ago by frank (previous) (diff)

comment:7 Changed 22 months ago by Inirit

If there is then I wouldn't know which one it was. Is there some way for me to find out?

comment:8 Changed 22 months ago by Inirit

I have solved it. The Intel HAXM extension I had used for the Android emulator was causing the problem. I uninstalled it, rebooted, and now the VM opens without error. I discovered the problem via this thread: however, I wouldn't have known to search for that error without your aid. Thank you for your help.

comment:9 Changed 22 months ago by veejae.1

Hi Inirit.

I faced the same problem. But I had never installed the HAXM extension. is there another solution to the problem?

comment:10 Changed 18 months ago by frank

Some other application must switch your machine into VT-x root mode. Check for all non-standard Windows applications. Also, the WinXP compatible mode uses VT-x as well.

comment:11 Changed 17 months ago by kyrotomia

Hi, I am having a similar issue, trying to execute a Windows XP 32bits VM inside a Windows 8 64 bits host. I really do have VT-X (CPU : i7-720QM), and just double checked my BIOS.

Error log : 00:00:04.690395 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={db7ab4ca-2a3f-4183-9243-c1208da92392} aComponent={Console} aText={VT-x is not available. (VERR_VMX_NO_VMX)}, preserve=false 00:00:04.706856 Power up failed (vrc=VERR_VMX_NO_VMX, rc=E_FAIL (0X80004005))

I do have HAXM extension installed for android emulator, and I also have Hyper-V service installed coming from Windows Phone Emulator 8.0 (but not any VM running at the moment). I'll try disabling them and see if it works.

However, I suspect this is a common setup for developpers. Any idea if this kind of app ecosystem can co-exist?

Version 0, edited 17 months ago by kyrotomia (next)
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