No error report when minecraft crashes

Are you using the old launcher or the new one?

Yes, I am. I just paid for Minecraft a week ago.

Are you using the old launcher or the new launcher ?

(Does the title of the window say "Minecraft" or "Minecraft Launcher 0.8.3 (Dev)"?)

'Minecraft'

That's the old one. Please try the new one (link in https://mojang.com/2013/06/minecraft-snapshot-13w23a/).

Gone away now. Thanks!