I found something which can help correcting the issue after all: - since the problem appear after the instalation of 2015 AMD drivers from WU, if you have them installed it will cause the bugs, even if you install the newer on top. - I didn't manage to clean it deeply with Windows tools. They still are stocked somewhere... - So I used DriverTalent to get rid of them once for all. It works! - Then you can install the 2016 drivers and block WU.