VM won't start: error initializing kernel driver

[oily]

I have the same problem:

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Failed to start the virtual machine Vista.
VT-x is not available. (VERR_VMX_NO_VMX).
Unknown error creating VM (VERR_VMX_NO_VMX).

VM Settings > System > Acceleration > Enable VT-x / AMD-V is enabled, but the checkbox is disabled so I can't deselect it. In fact, both options on that tab are blocked. At the moment I can't do anything past creating a VM. Once created, if I start it after changing settings (eg adding a DVD Drive) it'll go straight to the error. If I start it immediately after creation (without changing any of the VM's settings) then I get the first-run wizard. Once that wizard is complete I get the error on the VM.

Not sure why the first-run doesn't come up if you change the VM Settings before the first time you start it (bug maybe?) but either way, as soon as the VM tries to boot I get the error.

Are there any other ways to disable the VT setting? There's nothing in VirtualBox > Preferences to set it globally either

[tecodan]

I had the same problem where VT was enabled but the checkboxes in the System Config dialog were grayed out and I couldn't boot any VM because of the VERR_VMX_NO_VMX error.

I ended up editing the XML file and disabling it from there:
~/Library/VirtualBox/Machines/<machine>/<machine.xml

Find the line:
<HardwareVirtEx enabled="true" exclusive="false"/>

Change the enabled value to "false".

[oily]

tecodan, that worked a treat, thanks!

[nayanajith]

Find your your virtual machine vmname:

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VBoxManage list vms

Turn of Hardware VT-x

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VBoxManage modifyvm <your_vmname>  --hwvirtex off

Now start Virtualbox manager GUI or type:

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VirtualBox --startvm <your_vmname>

[schworak]

Just wanted to say thanks and it worked