Why is my editor window not openening?

I tried to open a widget blueprint, but the editor window wouldn’t open.
I tried updating UE4 to 4.18.3 up from 4.18.2, this dint help.
The problem exists in all my project, so its not a project setting.
Using [Windows key] and [up arrow] didn’t show the window either.
Its also not just with the widget blueprints, but with any editor window (materials, meshes, etc)
This pretty much means that i cant use UE4 at all, so i would love for someone to help me.