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I have a lab with various Servers running Windows Server 2025. Some of them are installed without Desktop Experience, some with. Aside from Desktop Experience, the VMs and the operating are configured the same way using automated setup scripts.

I exposed the VirtualizationExtensions for all VMs on the host using Set-VMProcessor -ExposeVirtualizationExtensions $true. Moreover, I configured all VMs to use static memory assignment.

However, when I try to install Hyper-V on Windows Servers 2025 with Desktop Experience, I receive the error Hyper-V cannot be installed because virtualization support is not enabled in the BIOS.

The issue occurs without any updates installed as well as with KB5050009 (2025-01 Cumulative Update for Microsoft server operating system 24H2 for x64 based Systems) installed. On machines without Desktop Experience, Hyper-V can be installed without any issues. As a side note, on VMs using Windows 11 24H2 on the same host, I can install Hyper-V without any issues.

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