How to fix hyper-v cannot be installed a hypervisor is already running

Enable-WindowsOptionalFeature –Online -FeatureName Microsoft-Hyper-V –All -NoRestart

The above command installs only the hypervisor but does not install the administration tools, if you want to manage the Hyper-V within the virtual machine you must install RSAT for Hyper-V to do this run the following command:

Install-WindowsFeature RSAT-Hyper-V-Tools -IncludeAllSubFeature

you want to create a cluster then you need to install the Cluster service, run:
Install-WindowsFeature RSAT-Clustering -IncludeAllSubFeature

you can install Multipath I/O to enable multiple paths to the storage, if this is your case follow:
Install-WindowsFeature Multipath-IO

Restart to finalize the virtual machine with the command:

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