Have to 'repair' quicktime every time after reboot for video

For some reason I have to either uninstall or repair Quicktime every single time I reboot my computer for video to display and work in Cubase.

It’s very annoying, what can I do to fix this problem and why am I having to do it after every reboot? Otherwise I just get a black video screen in Cubase an no video thumbnails when trying to open the same project that was working before restart. Any new video will say ‘video format not supported’. Close down Cubase, install quicktime, choose repair, open Cubase and the same video file will now work… Until I restart my computer and it will say ‘video format not supported’ unless I’ve installed quicktime prior to opening Cubase up again.

Help me please