This is a resurrection of at least one other thread ( https://social.technet.microsoft.com/Forums/exchange/en-US/7fb50377-f671-4bcd-88a9-87cf2b226985/event-id-1023-windows-cannot-load-the-extensible-counter-dll-msexchange-store-interface?forum=exchangesvrgeneral).
I am having the exact same issue. The post marked as the answer in the previous topic isn't correct as the file referenced does not exist anywhere on my server or on the installation media.
Does anyone have a fix for this?