My Minecraft used to work just fine, but then it started to bug a little. The map I've been working hard on suddenly was nowhere to be found in Minecraft, al though they were still located in the "/saves" folder and they looked fine. It had been like that for a while and then I tried shutting down the programme and opening up again, but when trying to open it, it lets me log in, and then it says "Programme not responding", and then it gives me the message: "Java(TM) Platform SE binary has stopped working", and CRASH..

Anyone got any ideas on what to do?

Thanks!