Solution is to just unclick "Enable OpenGL Drawing" in Edit->Preferences->General->Performances
Thanks to: Diedhert.
As stated before - it is a video card problem (driver).
I didn't succeeded to open any file.
I finally sorted it out.
Go to Edit > Preferences > General
Choose Performance - unclick 'Enable OpenGL Drawing'.
(How bizarre ... to figure it out if it really was due to this option, I clicked it back on ... everything works now).
Diederik