You attempt to open Server Manager, Active Directory Administrator Center, or Hyper-V console. The process starts in Task Manager, but the GUI does not appear. You find that sysfer.dll is being injected in the process using ProcMon.
This issue is fixed in Symantec Endpoint Protection 14.2 RU1. For information on how to obtain the latest build of Symantec Endpoint Protection, see Download the latest version of Symantec Endpoint Protection
To work around this issue, create an Application Control exception for the following processes (as applicable to your case):
To create an exception, please see How to create an Application Control exception or stop sysfer.dll injection into a process with SEP.