In domain environments, by default the remote registry service is started to allow for remote viewing of the registry by administrative users. However, either for security reasons or because the machine is NOT in a domain, this server may be shut down. You will need to re-enable the service to allow for viewing. For more information on this you can click on the following URL's below:
http://technet.microsoft.com/en-us/library/dd315496(WS.10).aspx