Unable to remotely manage Hyper-v from Windows 7 RPC - rpc server unavailable unable to establish communication between and

If you get this error when connecting to Hyper-V from a Windows 7 OS

RPC - rpc server unavailable unable to establish communication between Client and server

 Then you should follow these instructions.

First up, check you can start your firewall. If it's stopped and you get error 5 when starting it. Take a look at the below KB from Microsoft.
http://support.microsoft.com/kb/943996

If fixed the issue for me and also resolved my Hyper-V issue.