Can't even load a world. What?

---- Minecraft Crash Report ----
// There are four lights!

Time: 2/12/14 11:21 AM
Description: Updating screen events

java.lang.ExceptionInInitializerError
	at azi.a(SourceFile:1619)
	at bcm.e(SourceFile:162)
	at bcm.a(SourceFile:127)
	at bcl.a(SourceFile:172)
	at bcl.d(SourceFile:232)
	at bcl.k(SourceFile:211)
	at azi.p(SourceFile:1308)
	at azi.ah(SourceFile:760)
	at azi.f(SourceFile:711)
	at net.minecraft.client.main.Main.main(SourceFile:152)
Caused by: java.lang.IllegalStateException: failed to create a child event loop
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:61)
	at io.netty.channel.MultithreadEventLoopGroup.<init>(MultithreadEventLoopGroup.java:49)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:61)
	at io.netty.channel.nio.NioEventLoopGroup.<init>(NioEventLoopGroup.java:52)
	at ef.<clinit>(SourceFile:41)
	... 10 more
Caused by: io.netty.channel.ChannelException: failed to open a new selector
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:128)
	at io.netty.channel.nio.NioEventLoop.<init>(NioEventLoop.java:120)
	at io.netty.channel.nio.NioEventLoopGroup.newChild(NioEventLoopGroup.java:87)
	at io.netty.util.concurrent.MultithreadEventExecutorGroup.<init>(MultithreadEventExecutorGroup.java:57)
	... 14 more
Caused by: java.io.IOException: Unable to establish loopback connection
	at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
	at sun.nio.ch.PipeImpl$Initializer.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.nio.ch.PipeImpl.<init>(Unknown Source)
	at sun.nio.ch.SelectorProviderImpl.openPipe(Unknown Source)
	at java.nio.channels.Pipe.open(Unknown Source)
	at sun.nio.ch.WindowsSelectorImpl.<init>(Unknown Source)
	at sun.nio.ch.WindowsSelectorProvider.openSelector(Unknown Source)
	at io.netty.channel.nio.NioEventLoop.openSelector(NioEventLoop.java:126)
	... 17 more
Caused by: java.io.IOException: An established connection was aborted by the software in your host machine
	at sun.nio.ch.SocketDispatcher.read0(Native Method)
	at sun.nio.ch.SocketDispatcher.read(Unknown Source)
	at sun.nio.ch.IOUtil.readIntoNativeBuffer(Unknown Source)
	at sun.nio.ch.IOUtil.read(Unknown Source)
	at sun.nio.ch.SocketChannelImpl.read(Unknown Source)
	... 26 more


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

-- Head --
Stacktrace:
	at azi.a(SourceFile:1619)
	at bcm.e(SourceFile:162)
	at bcm.a(SourceFile:127)
	at bcl.a(SourceFile:172)
	at bcl.d(SourceFile:232)
	at bcl.k(SourceFile:211)

-- Affected screen --
Details:
	Screen name: bct
Stacktrace:
	at azi.p(SourceFile:1308)
	at azi.ah(SourceFile:760)
	at azi.f(SourceFile:711)
	at net.minecraft.client.main.Main.main(SourceFile:152)

-- System Details --
Details:
	Minecraft Version: 1.7.4
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 22010200 bytes (20 MB) / 79638528 bytes (75 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.7.4
	LWJGL: 2.9.1
	OpenGL: GeForce GT 640/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Shadow_RealmWIP.zip]
	Current Language: Canadian English (CA)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
	Anisotropic Filtering: Off (1)