Minecraft won't download worlds - playing is impossible

Hi,

I bought Minecraft for PC to my son just before Christmas and we downloaded it successful from Minecraft's site. But he can't play it, because when he select Single player game started downloaded ok, but when world has been downloaded it chrash. It has no difference is it a new world (it saves worlds name's ok and them are in the world-list but no one of them will not loaded right) or earlier created world.

We updated Java 8 and the platform is Windows 10. You can see Minecraft's log's as well. I hope you can help with this big problem because my other son wants also Minecraft for pc. We have also Playstation 3, 4 and Vita versions and them works great.