Those plugins fail to load when i lunch After.
From that folder:
C:\Program Files\Adobe\Adobe After Effects CC 2017\Support Files\(Media Core plug-ins)\Common
and therefore i cannot import any Mpeg/Quicktime/Windows video files into After.
Is it possible it's because i'm using windows 10 enterprise ?
Your help is appreciated !
Start by reinstalling the program with sufficient user privileges and also check your windows Media player components and system CoDecs. They may require reinstalling, too.
Did Tim's link help you?