January 30th, 2018

Why does hypervisor remain enabled even when Hyper-V is disabled in Windows Features?

Raymond Chen
Raymond Chen

A customer found that even though they set the hypervisorlaunchtype to off in the boot configuration, and they unchecked Hyper-V in the Turn Windows features on or off dialog, they found that hypervisor was still enabled. As a result, Oracle VM VirtualBox Manager refuses to create a 64-bit guest.

Someone from the kernel team explained that the hypervisor might still be enabled in the UEFI, so that’s one thing to check.

Another thing that will force the hypervisor on is Virtualization-Based Security, which goes by the acronym VBS. This is confusing because to most people VBS stands for VBScript.

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Old New Thing
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Author

Raymond Chen

Raymond has been involved in the evolution of Windows for more than 30 years. In 2003, he began a Web site known as The Old New Thing which has grown in popularity far beyond his wildest imagination, a development which still gives him the heebie-jeebies. The Web site spawned a book, coincidentally also titled The Old New Thing (Addison Wesley 2007). He occasionally appears on the Windows Dev Docs Twitter account to tell stories which convey no useful information.

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