The operation succeeded, but you must restart the Hyper-V Virtual Machine Management service to apply the changes. Stop all ...

The operation succeeded, but you must restart the Hyper-V Virtual Machine Management service to apply the changes. Stop all virtual machines running on the computer, or migrate virtual machines to another computer. Then, click the "Stop Service" button on the Actions pane to stop the service, and click the "Start service" button to start the service again.