Hi Olga,
i did the complete uninstall / delete folders / reinstall but no file works at all (i.e. .ts,.mkv,.avi,.mp4): So it must be something general.
When i doubleclick a videofile, the program opens but it doesn't load the file. There is no error message or crash.
In K-Lite the relevant Filters are active (LAV for Splitter, Video, Audio). Also two Solveig ActiveX codecs are active there.
Back on 5... for now.
Holger