MailClient entry point not found

Error when icon is clicked. Everytime it says

MailClient.exe - Entry Point Not Found…The procedure entry point RpcImpersonateClientContainer could not be located in the dynamic link library RPCRT4.dll. If I click it several times closing this error each time it eventually opens…but thats a pain!

Hi Bob,
I looked around and seems that this issue has been happening to people who updated to Win 10 from windows 7 and then turned back. Is this perhaps your situation as well? I recommend checking some answers on the Microsoft forums and see if any of your files haven’t been corrupted or if any of the offered solutions work for you:
http://answers.microsoft.com/en-us/wi…
http://answers.microsoft.com/en-us/wi…

Regards,
Olivia