When I'm testing any snapshot it closes, then a window pops up that says something related to java stopped and then the Minecraft closes

Put the summary of the bug you're having here

What I expected to happen was...: Being able to enjoy the snapshots

*What actually happened was...:*That the Minecraft was finished closed

Steps to Reproduce:
1. Well I really do not know if there are steps to follow, but this is just happening to me in windows 7, besides that I can not update java anymore since the computer does not accept me newer posts