Java minecraft petit problème

Bonjour,

j'ai un petit problème alors voilà ce que dit mon jeu quand je le lance moi j'ai une carte radeon 1go si quelqu'un peut m'aider

Bad video card drivers!
-----------------------

Minecraft was unable to start because it failed to find an accelerated OpenGL mode.
This can usually be fixed by updating the video card drivers.

--- BEGIN ERROR REPORT 7fe0271 --------
Generated 12/05/11 21:48

Minecraft: Minecraft Beta 1.5_01
OS: Windows 7 (amd64) version 6.1
Java: 1.6.0_22, Sun Microsystems Inc.
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
[failed to get system properties (java.lang.NullPointerException)]

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:185)
at
org.lwjgl.opengl.Display.createWindow(Display.java
:311)
at
org.lwjgl.opengl.Display.create(Display.java:856)

at
org.lwjgl.opengl.Display.create(Display.java:784)

at
org.lwjgl.opengl.Display.create(Display.java:765)

at net.minecraft.client.Minecraft.a(SourceFile:272)
at
net.minecraft.client.Minecraft.run(SourceFile:658)

at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 44eb6135 ----------