Finally a solution , seems like an old version of my graphics card driver interfered with the game. Just uninstall your current graphics card driver AND use this DriverSweeper utility to get rid of all files connected with any previous driver -
http://downloads.guru3d.com/Guru3D--...up)_d1655.html (you have to use that utility in a Windows safe mode - press F8 during booting and select "boot in safe mode".)
Then restart your PC and install this latest driver for your graphics card