Launcher 0.7.1 Crash

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 5/7/13 4:38 PM
Description: Initializing game

java.lang.ClassFormatError: Unknown constant tag 192 in class file javax/imageio/spi/ImageWriterSpi
	at javax.imageio.spi.IIORegistry.<clinit>(Unknown Source)
	at javax.imageio.ImageIO.<clinit>(Unknown Source)
	at ask.b(SourceFile:345)
	at ask.L(SourceFile:232)
	at ask.c(SourceFile:525)
	at net.minecraft.client.main.Main.main(SourceFile:78)


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

-- Head --
Stacktrace:
	at javax.imageio.spi.IIORegistry.<clinit>(Unknown Source)
	at javax.imageio.ImageIO.<clinit>(Unknown Source)
	at ask.b(SourceFile:345)
	at ask.L(SourceFile:232)

-- Initialization --
Details:
Stacktrace:
	at ask.c(SourceFile:525)
	at net.minecraft.client.main.Main.main(SourceFile:78)

-- System Details --
Details:
	Minecraft Version: 13w18c
	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: 6605904 bytes (6 MB) / 26742784 bytes (25 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	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: 2.9.0
	OpenGL: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Texture Pack: sd3321 pack.zip
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null