Problème minecraft

Bonjour à tous.
Alors voilà mon probleme est que dès que je lance minecraft après son bref chargement ce message s'affiche:
(ps: j'y ai deja jouer avant et tout marchait jusqu'à ce que j'installe un nouveau pack de texture...hier)

Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem.

If you wish to report this, please copy this entire text and email it to support@mojang.com.
Please include a description of what you did when the error occured.



--- BEGIN ERROR REPORT a1dce528 --------
Generated 27/06/11 11:07

Minecraft: Minecraft Beta 1.6.6
OS: Windows Vista (x86) version 6.0
Java: 1.6.0_24, Sun Microsystems Inc.
VM: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: GeForce 9600 GT/PCI/SSE2 version 3.2.0, NVIDIA Corporation

java.nio.BufferOverflowException
at java.nio.DirectByteBuffer.put(Unknown Source)
at java.nio.ByteBuffer.put(Unknown Source)
at jf.a(SourceFile:233)
at jf.b(SourceFile:139)
at net.minecraft.client.Minecraft.x(SourceFile:406)
at net.minecraft.client.Minecraft.a(SourceFile:321)
at net.minecraft.client.Minecraft.run(SourceFile:683)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 2ce3dd9 ----------

merci de m'aider a résoudre ce problème.