I can't create, open or load a world anymore. everytime the same thing happens, it freezes at building terrain and than closes and gives me a crash report. I've tried downgrading my Java 8 to Java 7, uninstalled all my virus scanners and completely reinstalling Minecraft, but none of these techniques got me anywhere. I shall attach the bug report.

P.S. English is not my first language, don't hate but apprec8