I have been seeing McTray.exe errors quite a bit lately. In all of my cases, they are related to the EEPC agent dll. I have tried installing the ePO agent, as well as EEPC components. The only thing I have found to work is removing EEPC and EEPC agent, followed by a reboot, then installing again. Unfortunately, this can only be done by decrypting the drive and deactivating it, so it is a time consuming process, and a real pain.
Make sure you installing MA 4.8 patch 2 (build 18.104.22.1680)