Voici le message :

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 24/08/14 14:33
Description: Initializing game

org.lwjgl.LWJGLException: Pixel format not accelerated
at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelForma
t(Native
Method)
at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat
(WindowsPeerInfo.java:52)

at org.lwjgl.opengl.WindowsDisplay.createWindow(Windo
wsDisplay.java:252)

at org.lwjgl.opengl.Display.createWindow(Display.java
:306)

at org.lwjgl.opengl.Display.create(Display.java:848)

at org.lwjgl.opengl.Display.create(Display.java:757)

at org.lwjgl.opengl.Display.create(Display.java:739)

at azi.ad(SourceFile:325)
at azi.f(SourceFile:696)
at net.minecraft.client.main.Main.main(SourceFile:152
)

A detailed walkthrough of the error, its code path and all known details is as follows:
--------------------------------------------------
-------------------------------------

-- Head --
Stacktrace:
at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelForma
t(Native
Method)
at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat
(WindowsPeerInfo.java:52)

at org.lwjgl.opengl.WindowsDisplay.createWindow(Windo
wsDisplay.java:252)

at org.lwjgl.opengl.Display.createWindow(Display.java
:306)

at org.lwjgl.opengl.Display.create(Display.java:848)

at org.lwjgl.opengl.Display.create(Display.java:757)

at org.lwjgl.opengl.Display.create(Display.java:739)

at azi.ad(SourceFile:325)

-- Initialization --
Details:
Stacktrace:
at azi.f(SourceFile:696)
at net.minecraft.client.main.Main.main(SourceFile:152
)

-- System Details --
Details:
Minecraft Version: 1.7.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 59271904 bytes (56 MB) / 126353408 bytes (120 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerfor
mance_javaw.exe_minecraft.exe.heapdump
-Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.4
LWJGL: 2.9.1
OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
GL Caps:
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: ~~ERROR~~ NullPointerException: null
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
Anisotropic Filtering: Off (1)

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svp