Broken game window then broken game

So i was playing against bots, when suddenly LoL left full screen and appeared in "window". I could live with that, since i use camera lock all the time, but after a few matches, that window started to slowly "go down", hiding my game in and under the Taskbar. After that game, LoL did not only hid even more but did not want to start at all. I couldnt screenshot but ill try to explain: Same window, "not-responding" coloring and crash. Tried to reset a few times but worthless. I dont know how much i can help you except that i have Windows 10.... Thank you for your support, and please dont ban me for another 20 minutes XD.