Minecraft: Necestio ayuda doy +5 si hace falta

Bueno pues me lo acabo de descargar no me deja iniciar sesión ¿Por qué? ¿Qué tengo que hacer para arreglarlo?

Y ahora otra cosa cuando intento probar la demo me aparece esto [spoiler]     Bad 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 26/01/13 0:34

-- System Details --
Details:
	Minecraft Version: 1.4.7
	Operating System: Windows XP (x86) version 5.1
	Java Version: 1.7.0_11, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 946470992 bytes (902 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 3 total; -Xbootclasspath/a:C:\ARCHIV~1\Java\jre7\lib\deploy.jar;C:\ARCHIV~1\Java\jre7\lib\javaws.jar;C:\ARCHIV~1\Java\jre7\lib\plugin.jar -Xmx1g -Xms1024M
	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:232)
	at asq.a(SourceFile:56)
	at net.minecraft.client.Minecraft.run(SourceFile:515)
	at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 217fbb50 ----------
[/spoiler] Porque me podrías ayudar con todo por favor y gracias