Minecraft crashes when launching map

Hi !

I installed the last version of minecraft and it worked well for a day.

The next day when I tried to connect to a server it crashed...

It seems to appear in the 3 seconds after the map has loaded and the envirement starts to appear. It also crashes when going through the in-game menu.
Same crash appears when playing in single player....

I can't play anymore !

Please help

Thanks in Advanced !