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---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 2/20/13 7:27 AM
Description: Exception occured in ModLoader

java.lang.VerifyError: (class: mod_UpdateManager, method: keyboardEvent signature: (Lafu;)V) Incompatible argument to function
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Unknown Source)
at java.lang.Class.getDeclaredFields(Unknown Source)
at ModLoader.setupProperties(ModLoader.java:1968)
at ModLoader.addMod(ModLoader.java:370)
at ModLoader.readFromModFolder(ModLoader.java:1384)
at ModLoader.init(ModLoader.java:909)
at ModLoader.addAllRenderers(ModLoader.java:215)
at bbu.<init>(RenderManager.java:94)
at bbu.<clinit>(RenderManager.java:14)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_13, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 394677128 bytes (376 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: ModLoader, EntityRendererProxy, ModTextureStatic, ...[vazkii.updatemanager.IUpdateManager, IUMAdvanced, ModListGui]
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
ModLoader: Mods loaded: 1
ModLoader 1.4.7
i need help how do i fix this

Have you done all of the necessary details, like, let's say, delete META-INF folder? Done that? If so, and its still crashing, try getting Minecraft Forge.