After I first installed Avast Antivirus, subsequent times I started my computer I have received two error messages:
iCloudServices.exe - Entry Point Not Found
The procedure entry point OBJC_CLASS_$_NSData could not be located in the dynamic link library
C:\Program Files(x86)\CommonFiles\Apple\InternetServices\AOSkit.dll
and
ApplePhotoStreams.exe - Ordinal Not Found
The ordinal 2013 could not be located in the dynamic link library
C:\ProgramFiles(x86)\Common Files\Apple\InternetServices\ApplePhotoStreams_main.dll