Finally. I just discovered a thing that solves my whole problem

I can select my target on keyboard ←→
For fuck's sake. I thought my problem is solved but it's not. Even with keyboard, I cannot select door to get out of a particular room... I don't know why, but the coursor aims in something by force. As I said, in the hero's room, the cursor is selected on the bed, no matter what I do. When I point on computer then computer is selected, but when I take my cursor out of the computer, it goes back to BED. The same goes for other locations. The cursor is aiming on something by force, even if I'm not pointing on it. In the living room, as you know, there are three doors, two white on the left and the green one on the right. In this location the green dors are selected by force and I can't select the two white doors at all, I can only go to the parent's bedroom through the green doors. From parent's bedroom I can only go back to the living room, which means I'm stuck again. Could someone please explain me what the bloody hell is going on?
P.S. I tried to explain that thing as clearly as possible, though I'm not an english native speaker. I hope you can understand it
EDIT: Oh my... I guess it was all because of playing on fullscreen. When I play without full screen, everything goes back to normal. I'm sorry for this mess.