Can't select anything!

Hey, I’ve taken a long break from blending now, but I tried getting back to it some weeks ago. The problem was, I couldn’t select anything, except from lamps? Nothing happens when I right click an object.
Tried to install the newest blender build, but it didn’t work. Un-installed blender and removed all the files, and re-installed. Same problem!

Does anyone here have a clue of what this can be? It’s really irritating me, because I can’t blend at all now! :frowning: