Minecraft plante sous windows 8

Bonjour,

Mon fils a acheté le jeu Minecraft, et depuis qu'il l'a installé sur son nouveau PC portable, ça ne fonctionne plus. Ca plante au bout de quelques secondes, avec par exemple l'affichage de la page suivante:

Completely ignored arguments: [--nativeLauncherVersion, 286]
[19:01:45] [Client thread/INFO]: Setting user: ppbizbee92
[19:01:45] [Client thread/INFO]: (Session ID is token:da6df73d9dcd484188c7647ae03bc57c:4e557e39a2144ad892598485df7c29e2)
[19:01:49] [Client thread/INFO]: LWJGL Version: 2.9.4
[19:01:52] [Client thread/INFO]: Reloading ResourceManager: Default
[19:01:54] [Sound Library Loader/INFO]: Starting up SoundSystem...
[19:01:54] [Thread-6/INFO]: Initializing LWJGL OpenAL
[19:01:54] [Thread-6/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[19:01:54] [Thread-6/INFO]: OpenAL initialized.
[19:01:54] [Sound Library Loader/INFO]: Sound engine started
[19:02:02] [Client thread/INFO]: Created: 512x512 textures-atlas
[19:02:17] [Client thread/INFO]: Connecting to play.epicube.fr, 25565
[19:02:34] [Client thread/INFO]: [CHAT] Bonjour ppbizbee92 et bienvenue sur EpiCube !
[19:02:34] [Client thread/INFO]: [CHAT] -----------------------------------------------------
[19:02:34] [Client thread/INFO]: [CHAT] Invitez les gens avec qui vous appréciez de jouer dans vos amis afin de garder le contact et pouvoir jouer plus facilement ensemble (/friends)
[19:02:34] [Client thread/INFO]: [CHAT] -----------------------------------------------------
[19:02:54] [Client thread/INFO]: [CHAT] [MTC] EpicVIP ? _Siloz_ a rejoint le hub !
[19:03:08] [Client thread/INFO]: [CHAT] [ZARFX] EpicVIP ? baptboys a rejoint le hub !
[19:03:09] [Client thread/INFO]: [CHAT] EpicVIP ? BlackOut_2B a rejoint le hub !
[19:03:23] [Client thread/INFO]: [CHAT] [AWSM] EpicVIP ? Isunjii_Tz a rejoint le hub !
[19:03:31] [Client thread/INFO]: [CHAT] EpicVIP ? Nicoplouf a rejoint le hub !
[19:03:31] [Client thread/INFO]: [CHAT] [Oreo] EpicVIP ? NoboruLen a rejoint le hub !
[19:03:39] [Client thread/INFO]: [CHAT] [FDr] EpicVIP ? SkYz0R_ a rejoint le hub !
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000000001ac0ad95, pid=1068, tid=2144
#
# JRE version: Java(TM) SE Runtime Environment (8.0_25-b18) (build 1.8.0_25-b18)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.25-b02 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C [ig7icd64.dll+0x6ad95]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\Benjamin\AppData\Roaming\.minecraft\hs_err_pid1068.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Comme je n'y connais vraiment pas grand chose, je viens ici demander de l'aide à qui le pourra..
Par avance grand merci!