Hey, I purchased minecraft and every time i try to play i get the message below..
My computer is powerful enough to play games like COD 4, and the Orange Box.
Ive updated Java and flash, and been recommended a couple of drivers on another forum and downloaded those on to my computer but still no luck... 
This happens for Alpha, Beta, Online and the downloaded version.
Can any one help?

      Minecraft has crashed!      

      ----------------------      

Minecraft has stopped running because it encountered a problem.

If you wish to report this, please copy this entire text and email it to

.

Please include a description of what you did when the error occured.

--- BEGIN ERROR REPORT a1dce528 --------

Generated 02/03/11 17:43

Minecraft: Minecraft Beta 1.3_01

OS: Windows Vista (x86) version 6.0

Java: 1.6.0_24, Sun Microsystems Inc.

VM: Java HotSpot(TM) Client VM (mixed mode, sharing), Sun Microsystems Inc.

LWJGL: 2.4.2

OpenGL: ATI Mobility Radeon HD 4500/5100 Series version 3.3.10151 Compatibility Profile Context, ATI Technologies Inc.

java.lang.IllegalArgumentException: input == null!

at javax.imageio.ImageIO.read(Unknown Source)

at oi.<init>(SourceFile:36)

at net.minecraft.client.Minecraft.a(SourceFile:277)

at net.minecraft.client.Minecraft.run(SourceFile:632)

at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 162e392b ----------

Cheers,
Luke