VirtualBox virtual machine not starting because of missing VT-X support

Today I ran into an issue where VirtualBox wouldn’t start my virtual machines anymore because of missing VT-X support. Which was strange as my CPU (Intel i7) does support this and it did work just a day ago. After some searching and trying the latest version of VirtualBox it turns out that Microsoft’s Hyper-V (Hyper Visor) was preventing VirtualBox from using this technology. Disabling PAE/NX would let me boot the virtual machine again, but without the CPU acceleration.

Disable Hyper-VTo disable Hyper-V in Windows 8 do the following:

  1. Press Windows key + X
  2. Click Programs and Features
  3. Click Turn Windows features on or off
  4. Expand Hyper-V
  5. Uncheck it
  6. Click OK

Now reboot your machine and try booting a virtual machine using VT-X.

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