Hi Shannon,
Actually, you can hide the menu in the Host settings. Here is how it looks like in the Host 6.9.0.1 settings:
In older versions including the current stable version 6.8.0.1 this option is available in Settings for Host -> Options.
Note, however, that if the user is administrator on their machine and you hide the menu, they will still be able to stop the Host. We cannot go against Windows security architecture and prevent full admins from doing whatever they want on their machine.
Thanks.