The RPC server is unavailable. (Exception from HRESULT: 0x800706BA) while Replace in Microsoft Word using VB application

Guys i face the problem The RPC server is unavailable.

(Exception from HRESULT: 0x800706BA)

while Replace in Microsoft Word using VB application

1. I'm enable the WMI in Firewall.
2. allow the vba application in Word Application too.
3. Remove the Protection view in Microsoft Word Application.
4. My application running in same system.
5. PRC related services are all running correctly.
6. Made changes in Registery settings too.

what can i do for this kind of problem