Outlook and Skype for Business attempt to connect to '\RPC Control\C2RClientAPI_Server_System16' during startup and initialization. One of those ALPC ports is '\RPC Control\C2RClientAPI_Server_System16'. OfficeClickToRun.exe hosts the ClickToRunSvc service, which hosts a number of ALPC endpoints. Right-click on Microsoft Office Click-to-Run Service, and select Stop. Scroll down to Background processes, find Microsoft Office Click-to-Run (SxS), click on the ' > ' button to reveal the Microsoft Office Click-to-Run Service. Press CTRL+ALT+DEL, and then click Task Manager.
Right-click the taskbar, and then click Task Manager.
