Presumably you meant: SCECLI.dll, not secli.dll.
Googling all three files, seems to indicate that they are all legitimate Windows files.
Check the properties of each file in Windows\System32 for confirmation.
I don't generally delete files which have presumably been installed by the OS.
This is what appears in my Windows\System32:
All 3 files dated 14.4.2008
(modified the 29.8.2002 files, on installation of SP3)
Windows Security Configuration Editor Client Engine
Net Logon Services DLL
Event logging service
Edited by petewills , 19 November 2009 - 09:34 AM.