Problème Java au lancement de minecraft

Bonjour,
J'ai installé minecraft (version illégitime, oui hélas, même avec toute la confiance du monde mes parents sont des flippés de l'achat sur internet) sur l'ordi à ma soeur en copiant directement mes fichiers et en les collants sur son ordi à elle.
Le problème est le suivant : Dès lors que j'ouvre minecraft.exe et que je clique sur "Enter game", il y a un temps de latence et la fenêtre se ferme.

Puis un fichier notepad se créer, un rapport de crash java qui est le suivant (désolé c'est long) :

#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6ed85861, pid=4812, tid=3644
#
# JRE version: 6.0_20-b02
# Java VM: Java HotSpot(TM) Client VM (16.3-b01 mixed mode windows-x86 )
# Problematic frame:
# C [aticfx32.dll+0x25861]
#
# 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.
#

--------------- T H R E A D ---------------

Current thread (0x4a8d6c00): JavaThread "Minecraft main thread" daemon [_thread_in_native, id=3644, stack(0x4c720000,0x4c770000)]

siginfo: ExceptionCode=0xc0000005, reading address 0x0000013c

Registers:
EAX=0x00000008, EBX=0x4c76f28c, ECX=0x0000000a, EDX=0x00000000
ESP=0x4c76e898, EBP=0x4c76e8a4, ESI=0x4b2e2898, EDI=0x4b2e07d0
EIP=0x6ed85861, EFLAGS=0x00010202

Top of Stack: (sp=0x4c76e898)
0x4c76e898: 4c76f28c 4b2e07d0 00000000 4c76f23c
0x4c76e8a8: 6ed83f2c 400000c0 4c76f28c 002d55dc
0x4c76e8b8: 0064ee40 400000c0 00000000 4c76e8d0
0x4c76e8c8: 00000960 400000c0 00000001 088d0000
0x4c76e8d8: 0000000a 00000000 00000008 00000007
0x4c76e8e8: 0000027c 0000073b 00000001 00000001
0x4c76e8f8: 00008bc3 00000001 00001f9d 000007fc
0x4c76e908: 00000001 e2f32107 000001ba 00f7ff3f

Instructions: (pc=0x6ed85861)
0x6ed85851: 6e 8b f0 85 f6 74 1b 8b 47 20 8b 4f 14 83 c0 08
0x6ed85861: 8b 80 34 01 00 00 50 8b c7 e8 21 ff ff ff 8b f0


Stack: [0x4c720000,0x4c770000], sp=0x4c76e898, free space=13a4c76e37ck
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [aticfx32.dll+0x25861]
C [aticfx32.dll+0x23f2c]
C [atigktxx.dll+0x1daf]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(JIILorg/lwjgl/opengl/PixelFormat;Ljava/nio/IntBuffer;ZZZZ)I+0
j org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(JIILorg/lwjgl/opengl/PixelFormat;Ljava/nio/IntBuffer;ZZZZ)I+15
j org.lwjgl.opengl.WindowsDisplay.createWindow(Lorg/lwjgl/opengl/DisplayMode;Ljava/awt/Canvas;II)V+176
j org.lwjgl.opengl.Display.createWindow()V+68
j org.lwjgl.opengl.Display.create(Lorg/lwjgl/opengl/PixelFormat;Lorg/lwjgl/opengl/Drawable;Lorg/lwjgl/opengl/ContextAttribs;)V+63
j org.lwjgl.opengl.Display.create(Lorg/lwjgl/opengl/PixelFormat;)V+9
j net.minecraft.client.Minecraft.a()V+177
j avv.a()V+94
j net.minecraft.client.Minecraft.run()V+6
j java.lang.Thread.run()V+11
v ~StubRoutines::call_stub

--------------- P R O C E S S ---------------

Java Threads: ( => current thread )
=>0x4a8d6c00 JavaThread "Minecraft main thread" daemon [_thread_in_native, id=3644, stack(0x4c720000,0x4c770000)]
0x4a8d6400 JavaThread "Timer hack thread" daemon [_thread_blocked, id=2500, stack(0x4c690000,0x4c6e0000)]
0x4a76f800 JavaThread "Snooper Timer" daemon [_thread_blocked, id=952, stack(0x4b370000,0x4b3c0000)]
0x02189800 JavaThread "DestroyJavaVM" [_thread_blocked, id=5236, stack(0x00390000,0x003e0000)]
0x4a836400 JavaThread "AWT-EventQueue-0" [_thread_blocked, id=4072, stack(0x4b110000,0x4b160000)]
0x4a781000 JavaThread "AWT-Windows" daemon [_thread_in_native, id=5704, stack(0x4acd0000,0x4ad20000)]
0x0212fc00 JavaThread "AWT-Shutdown" [_thread_blocked, id=496, stack(0x4ac40000,0x4ac90000)]
0x0212b000 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=648, stack(0x4ab70000,0x4abc0000)]
0x02102800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=5644, stack(0x4a680000,0x4a6d0000)]
0x020fdc00 JavaThread "CompilerThread0" daemon [_thread_blocked, id=3748, stack(0x4a5f0000,0x4a640000)]
0x020fcc00 JavaThread "Attach Listener" daemon [_thread_blocked, id=5152, stack(0x4a560000,0x4a5b0000)]
0x020f9c00 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=3616, stack(0x4a4d0000,0x4a520000)]
0x020ccc00 JavaThread "Finalizer" daemon [_thread_blocked, id=5300, stack(0x4a440000,0x4a490000)]
0x020c8000 JavaThread "Reference Handler" daemon [_thread_blocked, id=3784, stack(0x4a3b0000,0x4a400000)]

Other Threads:
0x020c5800 VMThread [stack: 0x4a320000,0x4a370000] [id=688]
0x02114400 WatcherThread [stack: 0x4a710000,0x4a760000] [id=5340]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap
def new generation total 157248K, used 88893K [0x04190000, 0x0ec30000, 0x196e0000)
eden space 139776K, 63% used [0x04190000, 0x0985f6d0, 0x0ca10000)
from space 17472K, 0% used [0x0ca10000, 0x0ca10000, 0x0db20000)
to space 17472K, 0% used [0x0db20000, 0x0db20000, 0x0ec30000)
tenured generation total 349568K, used 0K [0x196e0000, 0x2ec40000, 0x44190000)
the space 349568K, 0% used [0x196e0000, 0x196e0000, 0x196e0200, 0x2ec40000)
compacting perm gen total 12288K, used 10201K [0x44190000, 0x44d90000, 0x48190000)
the space 12288K, 83% used [0x44190000, 0x44b86730, 0x44b86800, 0x44d90000)
No shared spaces configured.

Dynamic libraries:
0x00400000 - 0x00424000 C:\Windows\SysWOW64\javaw.exe
0x77b40000 - 0x77cc0000 C:\Windows\SysWOW64\ntdll.dll
0x72e20000 - 0x72e5f000 C:\Program Files\AVAST Software\Avast\snxhk.dll
0x75cb0000 - 0x75dc0000 C:\Windows\syswow64\KERNEL32.dll
0x75560000 - 0x755a7000 C:\Windows\syswow64\KERNELBASE.dll
0x75e50000 - 0x75ef0000 C:\Windows\syswow64\ADVAPI32.dll
0x76560000 - 0x7660c000 C:\Windows\syswow64\msvcrt.dll
0x75fa0000 - 0x75fb9000 C:\Windows\SysWOW64\sechost.dll
0x76170000 - 0x76260000 C:\Windows\syswow64\RPCRT4.dll
0x75220000 - 0x75280000 C:\Windows\syswow64\SspiCli.dll
0x75210000 - 0x7521c000 C:\Windows\syswow64\CRYPTBASE.dll
0x75b70000 - 0x75c70000 C:\Windows\syswow64\USER32.dll
0x75dc0000 - 0x75e50000 C:\Windows\syswow64\GDI32.dll
0x75550000 - 0x7555a000 C:\Windows\syswow64\LPK.dll
0x752f0000 - 0x7538d000 C:\Windows\syswow64\USP10.dll
0x75290000 - 0x752f0000 C:\Windows\system32\IMM32.DLL
0x76290000 - 0x7635c000 C:\Windows\syswow64\MSCTF.dll
0x7c340000 - 0x7c396000 C:\Program Files (x86)\Java\jre6\bin\msvcr71.dll
0x6d800000 - 0x6da97000 C:\Program Files (x86)\Java\jre6\bin\client\jvm.dll
0x73e60000 - 0x73e92000 C:\Windows\SysWOW64\WINMM.dll
0x74c70000 - 0x74cbc000 C:\Windows\system32\apphelp.dll
0x6d7b0000 - 0x6d7bc000 C:\Program Files (x86)\Java\jre6\bin\verify.dll
0x6d330000 - 0x6d34f000 C:\Program Files (x86)\Java\jre6\bin\java.dll
0x6d290000 - 0x6d298000 C:\Program Files (x86)\Java\jre6\bin\hpi.dll
0x75c70000 - 0x75c75000 C:\Windows\syswow64\PSAPI.DLL
0x6d7f0000 - 0x6d7ff000 C:\Program Files (x86)\Java\jre6\bin\zip.dll
0x6d000000 - 0x6d14a000 C:\Program Files (x86)\Java\jre6\bin\awt.dll
0x73200000 - 0x73251000 C:\Windows\SysWOW64\WINSPOOL.DRV
0x75720000 - 0x7587c000 C:\Windows\syswow64\ole32.dll
0x73260000 - 0x733fe000 C:\Windows\WinSxS\x86_microsoft.windows.common-controls_6595b64144ccf1df_6.0.7601.17514_none_41e6975e2bd6f2b2\COMCTL32.dll
0x75f40000 - 0x75f97000 C:\Windows\syswow64\SHLWAPI.dll
0x72e60000 - 0x72e73000 C:\Windows\SysWOW64\DWMAPI.DLL
0x72e80000 - 0x72f00000 C:\Windows\system32\uxtheme.dll
0x6d230000 - 0x6d284000 C:\Program Files (x86)\Java\jre6\bin\fontmanager.dll
0x73150000 - 0x73166000 C:\Windows\SysWOW64\CRYPTSP.dll
0x730f0000 - 0x7312b000 C:\Windows\system32\rsaenh.dll
0x73ba0000 - 0x73bb7000 C:\Windows\SysWOW64\USERENV.dll
0x73c00000 - 0x73c0b000 C:\Windows\SysWOW64\profapi.dll
0x6d610000 - 0x6d623000 C:\Program Files (x86)\Java\jre6\bin\net.dll
0x75ef0000 - 0x75f25000 C:\Windows\syswow64\WS2_32.dll
0x75f30000 - 0x75f36000 C:\Windows\syswow64\NSI.dll
0x73b00000 - 0x73b3c000 C:\Windows\system32\mswsock.dll
0x731f0000 - 0x731f6000 C:\Windows\System32\wship6.dll
0x73180000 - 0x73190000 C:\Windows\system32\NLAapi.dll
0x73170000 - 0x73180000 C:\Windows\system32\napinsp.dll
0x73130000 - 0x73142000 C:\Windows\system32\pnrpnsp.dll
0x72d90000 - 0x72db7000 C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live\WLIDNSP.DLL
0x72d60000 - 0x72d81000 C:\Program Files (x86)\Bonjour\mdnsNSP.dll
0x74730000 - 0x7474c000 C:\Windows\SysWOW64\Iphlpapi.DLL
0x74720000 - 0x74727000 C:\Windows\SysWOW64\WINNSI.DLL
0x72dd0000 - 0x72e14000 C:\Windows\SysWOW64\DNSAPI.dll
0x72d50000 - 0x72d58000 C:\Windows\System32\winrnr.dll
0x73af0000 - 0x73af5000 C:\Windows\System32\wshtcpip.dll
0x72d00000 - 0x72d06000 C:\Windows\SysWOW64\rasadhlp.dll
0x72d10000 - 0x72d48000 C:\Windows\System32\fwpuclnt.dll
0x76470000 - 0x764ff000 C:\Windows\syswow64\OLEAUT32.DLL
0x6d630000 - 0x6d639000 C:\Program Files (x86)\Java\jre6\bin\nio.dll
0x4b300000 - 0x4b36b000 C:\Users\TOSHIBA\AppData\Roaming\.minecraft\bin\natives\lwjgl.dll
0x6e5a0000 - 0x6e668000 C:\Windows\SysWOW64\OPENGL32.dll
0x74650000 - 0x74672000 C:\Windows\SysWOW64\GLU32.dll
0x6e2a0000 - 0x6e387000 C:\Windows\SysWOW64\DDRAW.dll
0x74690000 - 0x74696000 C:\Windows\SysWOW64\DCIMAN32.dll
0x759d0000 - 0x75b6d000 C:\Windows\syswow64\SETUPAPI.dll
0x759a0000 - 0x759c7000 C:\Windows\syswow64\CFGMGR32.dll
0x77260000 - 0x77272000 C:\Windows\syswow64\DEVOBJ.dll
0x74cd0000 - 0x74cd9000 C:\Windows\SysWOW64\VERSION.dll
0x6d360000 - 0x6d366000 C:\Program Files (x86)\Java\jre6\bin\jawt.dll
0x4cc00000 - 0x4d6a5000 C:\Windows\SysWOW64\ig4icd32.dll
0x74640000 - 0x74648000 C:\Windows\SysWOW64\atigktxx.dll
0x6ed60000 - 0x6ede8000 C:\Windows\SysWOW64\aticfx32.dll

VM Arguments:
jvm_args: -Xms512m -Xmx1024m -Dsun.java2d.noddraw=true -Dsun.java2d.d3d=false -Dsun.java2d.opengl=false -Dsun.java2d.pmoffscreen=false
java_command: net.minecraft.LauncherFrame
Launcher Type: SUN_STANDARD

Environment Variables:
PATH=C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Program Files (x86)\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Windows Live\Shared;c:\program files (x86)\java\jre6\bin
USERNAME=TOSHIBA
OS=Windows_NT
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 37 Stepping 5, GenuineIntel



--------------- S Y S T E M ---------------

OS: Windows 7 Build 7601 Service Pack 1

CPU:total 2 (8 cores per cpu, 2 threads per core) family 6 model 37 stepping 5, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, popcnt, ht

Memory: 4k page, physical 3984048k(2308180k free), swap 7966236k(5679068k free)

vm_info: Java HotSpot(TM) Client VM (16.3-b01) for windows-x86 JRE (1.6.0_20-b02), built on Apr 12 2010 13:52:23 by "java_re" with MS VC++ 7.1 (VS2003)

time: Tue Jun 18 20:30:33 2013
elapsed time: 12 seconds


Voilà voilà. Si des âmes charitables se sentent de se pencher sur mon soucis je leur saurais grès. Merci à vous, bonne soirée à tous.