Erreur à l'ouverture de Minecraft

---- Minecraft Crash Report ----
// Ooh. Shiny.

Time: 29/05/14 13:33
Description: Initializing game

org.lwjgl.LWJGLException: Pixel format not accelerated
 at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
 at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
 at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.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 ban.ag(SourceFile:340)
 at ban.f(SourceFile:713)
 at net.minecraft.client.main.Main.main(SourceFile:148)


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

-- Head --
Stacktrace:
 at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
 at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
 at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.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 ban.ag(SourceFile:340)

-- Initialization --
Details:
Stacktrace:
 at ban.f(SourceFile:713)
 at net.minecraft.client.main.Main.main(SourceFile:148)

-- System Details --
Details:
 Minecraft Version: 1.7.9
 Operating System: Windows 8.1 (x86) version 6.3
 Java Version: 1.7.0_55, Oracle Corporation
 Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
 Memory: 4668128 bytes (4 MB) / 26808320 bytes (25 MB) up to 518979584 bytes (494 MB)
 JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
 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: 1.7.9
 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: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
 Anisotropic Filtering: Off (1)