Minecraft: ¿Alguien me puede ayudar?

No puedo iniciar Minecraft. Cuando entro, introduzco mi "user name", "password" y pulso login. Hasta ahí todo bien, pero en lugar de salir el menú, me aparece un error y no sé cómo solucionarlo.

Este es el mensaje que me pone:

[spoiler]  
      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 16/04/13 18:52

-- System Details --
Details:
	Minecraft Version: 1.5.1
	Operating System: Windows XP (x86) version 5.1
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 408793776 bytes (389 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	LWJGL: 2.4.2
	OpenGL: ~~ERROR~~ NullPointerException: null
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null[failed to get system properties (java.lang.NullPointerException)]


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: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:235)
	at avv.a(SourceFile:56)
	at net.minecraft.client.Minecraft.run(SourceFile:507)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT bc4007e9 ----------

 [/spoiler]

[b]¿Alguien puede decirme qué significa y [u]cómo puedo solucionarlo[/u]?[/b]
EDITADO EL 16-04-2013 / 19:59 (EDITADO 1 VEZ)