Arduino Mega 2560 Connection problem to PC

The screenshot is in dutch, I hope that you're able to understand it according to the positions of the menus.
As I said, The top one says 'other devices' and the deivce is called 'unknown device'

I have also included the properties of the device. It says that the drivers aren;t installed, but I tried to install them (also manually) several times without any luck.

I hope that this helps