The RPC server is unavailable. (Exception from HRESULT: 0x800706BA)

Check to see if the Remote Procedure Call (RPC) service is running. If it is, then it’s a firewall issue between your workstation and the server. You can test it by temporary disabling the firewall and retrying the command.

Edit after comment:

Ok, it’s a firewall issue. You’ll have to either limit the ports WMI/RPC work on, or open a lot of ports in the McAfee firewall.

Here are a few sites that explain this:

  1. Microsoft KB for limiting ports
  2. McAfee site talking about the same thing

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