Multiplayer Crashes!?

Well well well... :'(

Hello dear players! When I open the multiplayer, the game shuts down without leaving any messages like crash java reports etc. But, I find the crash reports in the ''Crash Reports'' folder at %appdata ---> .minecraft. I have Windows XP and Premium Minecraft. What can I do?

Things I've already tried:

± Unistall Java and install it again.
± Unistall and install premium minecraft launcher again.
± Delete some folders from the .minecraft folder.
± Close many times my PC.