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I was using FML and the custom npcs mod, and then attempted to install the instant massive structures mod. Didn't work, so I attempted to re-install the minecraft jar, that worked but when I got to the Mojang screen it crashed. I attempted taking out minecraft jar and minecraft 1.4.2 jar. Now I try to login to the launcher and it says, cannot play not downloaded. So I go to minecraft.net and reinstall the launcher, same problem.

I use Windows 7, i believe 32 bit.Also, I used optifine as well.
Here's the crash report
---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.
Time: 11/3/12 1:10 PM
Description: Failed to start game
java.lang.NullPointerException
at java.io.Reader.<init>(Unknown Source)
at java.io.InputStreamReader.<init>(Unknown Source)
at be.a(SourceFile:56)
at be.a(SourceFile:91)
at net.minecraft.client.Minecraft.a(SourceFile:249)
at net.minecraft.client.Minecraft.run(SourceFile:515)
at java.lang.Thread.run(Unknown Source)
Relevant Details:
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.6.0_26, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 824380160 bytes (786 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 5 total; -Xbootclasspath/a:C:\\PROGRA~1\\Java\\jre6\\lib\\deploy.jar;C:\\PROGRA~1\\Java\\jre6\\lib\\javaws.jar;C:\\PROGRA~1\\Java\\jre6\\lib\\plugin.jar -Xmx1g -Xms1024M -Xmx1g -Xms1024M
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- LWJGL: 2.4.2
- OpenGL: ATI Radeon 3100 Graphics GL version 2.1.8794, ATI Technologies Inc.
- Is Modded: Probably not
- Type: Client
- Texture Pack: Last Days Apocolypto.zip
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null