Board Thread:Questions and Answers/@comment-86.154.251.123-20130821152209/@comment-110.20.90.35-20140331073315

This is the 100% working fix.

goto this website and choose the 64 bit version of your OS. you need a 64 bit system aswell. http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

once thats done, you can change the ram allocated in the gear in the launcher screen. 2 ez