Once again, this is one of those completely infuriating error messages. It’s the kind of message that gives you no idea as to what is actually going on. I have heard this error messaging cropping up a lot when folks try to open or send messages via Outlook. Fortunately, if you are willing to do a little work, you can fix the problem.
Go to start > run > type “regedit” and find this value and add these. right click on the ClientProtocols container and select the New -> String Value command. Type the name of the missing value when prompted and press Enter. Then, right click on the value that you just created and select Modify. Finally, enter RPCRT4.DLL as the value data and click OK.
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols
]
“ncacn_np”=”rpcrt4.dll”
“ncacn_ip_tcp”=”rpcrt4.dll”
“ncadg_ip_udp”=”rpcrt4.dll”
“ncacn_http”=”rpcrt4.dll”
That should take care of your silly RPC error message.
