Minecraft screwing up

sometimes minecraft screws up and if you've had it screwed up and you just found a diamond or you just killed the ender dragon. then all of the sudden CRASH i don't mean a computer crashes on another computer or something i mean crashing mninecraft shuts down or in the scientific terms MINECRAFT SCREWED UP!
Minecraft 1.6.4
now it is minecraft 1.6.4 and still minecraft crashes sometimes i mean i started minecraft when it was 1.4.7 and it crashed more then. but now it's getting better but as you see in the picture minecraft says fullscreen when it's not but that's just one of the little things. and i know many of you have tried to do a video and minecraft crashed like thisit will lead you to a tobuscus minecraft video and it crashed! you see minecraft crashes a lot. hope you liked this blog and if your minecraft has crashed give it a diamond there is gonna be a LOTof diamonds hope you like this blog! this is for the people that gave me a diamond!