MT 2017 starts but its window is not accesible

A few days ago I installed Trados and Multiterm on my brand new PC. If SDL Trados Studio 2017 works normally, since the very beginning I can't use NT 2017. It starts, it is visible in Task Manager as working but its window is hidden somewhere, I can select it on the task bar but it never opens. I am pretty dure that that this is probably related to W (W10 in my case), not to MT itself (but maybe?), however maybe some of you experienced the same problem and solved it. 

Any advice would be great. 

Regards

 

jacek