I have Acrobat DC installed as a part of Creative Cloud because I need it to do my work as a graphic designer. In meanwhile my IT dept pushes Reader to all the stations. I can have both installed, but why the Reader so aggressively and violating all the settings sets itself as a default PDF viewer while I want to work in DC all the time? If I set Acrobat DC as a default PDF viewer it should stay as a default viewer!