OOPS!! Sorry this was suppossed to go into IC2 support, Reposting there now. Sorry for any confussion caused
Same problem here, I followed the install instructions and order on the wiki and it all works fine until I put the IC2 jar file into the mods folder. When I take it out of the mod folder minecraft works again. I may just be an idiot, but I really want to get this working because basic minecraft is boring to me, I only play it with IC and Buildcraft(which I haven't put in yet)
Mods loaded: 1
ModLoader Beta 1.8.1
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 support@mojang.com.
Please include a description of what you did when the error occured.
--- BEGIN ERROR REPORT 5424363c --------
Generated 10/4/11 12:46 PM
Minecraft: Minecraft Beta 1.8.1
OS: Windows 7 (amd64) version 6.1
Java: 1.6.0_27, Sun Microsystems Inc.
VM: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 5700 Series version 4.1.11079 Compatibility Profile Context, ATI Technologies Inc.
java.io.EOFException: Unexpected end of ZLIB input stream
at java.util.zip.InflaterInputStream.fill(Unknown Source)
at java.util.zip.InflaterInputStream.read(Unknown Source)
at java.util.zip.ZipInputStream.read(Unknown Source)
at java.util.zip.ZipInputStream.closeEntry(Unknown Source)
at java.util.zip.ZipInputStream.getNextEntry(Unknown Source)
at ModLoader.readFromModFolder(ModLoader.java:1173)
at ModLoader.init(ModLoader.java:824)
at ModLoader.AddAllRenderers(ModLoader.java:186)
at aam.<init>(aam.java:61)
at aam.<clinit>(aam.java:10)
at net.minecraft.client.Minecraft.a(SourceFile:259)
at net.minecraft.client.Minecraft.run(SourceFile:629)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 2a02d514 ----------