I’m running Windows Server 2008 R2 on my laptop and after I Hyper-V role the following error message showed, when trying to start a Hyper-V machine. Seems the Hyper-Visor entry was never made to the BCD store.

To add the hypervisor auto launch into the BCD store you’ll need to run the following command in administrator mode

bcdedit /set hypervisorlaunchtype auto

make sure virtualization feature is enabled in BIOS!