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Enable Virtualization on Dell Optiplex 755

If you want to use Microsoft Hyper-V or Oracle VirtualBox on a Dell OptiPlex 755 system you will need to make/confirm  four (4) specific BIOS setttings.

In the BIOS Setup [F2] change or confirm the following settings if you are receiving errors that the computer does not support virtualization.

  1. Performance -> Virtualization = On
  2. Performance -> VT for Direct I/O Access = On
  3. Performance -> Trusted Execution = Off
  4. Security -> Execute Disable = On