Symptoms
Unable to find 'Enable nested virtualization' option in Windows 10 virtual machine configuration on Parallels Desktop Pro/Business edition.
![No nested virtualization alttext](http://kb.parallels.com/Attachments/kcs-39734/no%20nested%20virt.png)
Cause
Wrong Operation System type is specified in virtual machine's Configuration.
![Wrong Operation System alttext](http://kb.parallels.com/Attachments/kcs-39734/wrong%20OS.png)
Resolution
Change virtual machine's Operation System type:
- Shut down virtual machine and open it's configuration.
- Switch to General tab.
Press dropdown menu located above the Name field:
- Switch to Auto-detect or Windows 10.
- Switch to Hardware tab then to CPU & Memory.
Expand Advanced settings option and tick 'Enable nested virtualization' option.
- Close configuration window and launch virtual machine.
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