error "VT-x is not available (VERR_VMX_NO_VMX)."

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I am trying to start a virtual machine. I am using Virtual Box. I get the following error when I try to start it:

VT-x is not available (VERR_VMX_NO_VMX).
Aug 9, 2019 in Others by pam
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1 answer to this question.

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Hi@pam,

There are few reasons behind this error. Le's discuss these.

  • Check VT-X is enabled in the BIOS settings or not. If not than enable it.

  • Check if Hyper-V virtualization is enabled in Windows. This is the most common cause why this error occurs. Since .Microsoft’s Hyper-V technology is known to conflict with VT-X, the OS will automatically disable VT-x if Hyper-V virtualization is enabled. To disable this use the bellow command from Windows PowerShell. 

  dism.exe /Online /Disable-Feature:Microsoft-Hyper-V
  • Disable Core isolation from Windows Defender.

Hope these steps will solve the error.

Thank You

answered Feb 28 by akhtar
• 4,660 points

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