Trying to open MC world then crashes

Oh yeah don`t mind the "Is modded: Definitly" Because it was running 3 mods :Forge, Minecraft coder pack, and Forge mod loader i think. I already uninstall the other 20 mods and the same problem.

That's the problem.

Is Modded: Definitely; Client brand changed to 'fml,forge'

Please attach a crash report that shows it occurs in Vanilla Minecraft (Unmodified).

I dont know how to uninstall mods. i used the Skydaz Mod installers But ill try

Now when i try without mods the game wont even start onto the "MOJANG" screen

Here is what shows up : [21:20:53] [Client thread/INFO]: Setting user: Player
[21:20:54] [Client thread/INFO]: (Session ID is token:8cbfd9c7047240a3a1e261d70ec7fbab:00000000-0000-0000-0000-000000000000)
Exception in thread "Client thread" com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 11386
at com.google.gson.Gson.assertFullConsumption(Gson.java:779)
at com.google.gson.Gson.fromJson(Gson.java:769)
at ry.b(SourceFile:148)
at ry.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:155)
at cyk.<init>(SourceFile:40)
at bsu.<init>(SourceFile:282)
at net.minecraft.client.main.Main.main(SourceFile:120)
Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 11386
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1386)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:531)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:414)
at com.google.gson.Gson.assertFullConsumption(Gson.java:775)
... 7 more

Please attach the complete crash report.

Mods destroyed some of Minecraft's files.

Before reinstalling the complete Minecraft, you can try to fix this by deleting .minecraft/versions.

Anyway, this is a technical support issue; this site is for bug reports only. For technical support please use the Mojang Support Center.

Just got Crash Report :---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 10/6/14 12:44 PM
Description: Starting integrated server

com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 11386
at com.google.gson.Gson.assertFullConsumption(Gson.java:779)
at com.google.gson.Gson.fromJson(Gson.java:769)
at ns.b(SourceFile:156)
at ns.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
at bsx.<init>(SourceFile:38)
at bao.a(SourceFile:1610)
at bee.a(SourceFile:217)
at bdw.a(SourceFile:172)
at bee.a(SourceFile:446)
at bdw.k(SourceFile:232)
at bdw.p(SourceFile:211)
at bao.p(SourceFile:1328)
at bao.ak(SourceFile:774)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)
Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 11386
at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1505)
at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1386)
at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:531)
at com.google.gson.stream.JsonReader.peek(JsonReader.java:414)
at com.google.gson.Gson.assertFullConsumption(Gson.java:775)
... 15 more

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

– Head –
Stacktrace:
at com.google.gson.Gson.assertFullConsumption(Gson.java:779)
at com.google.gson.Gson.fromJson(Gson.java:769)
at ns.b(SourceFile:156)
at ns.<init>(SourceFile:42)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:114)
at bsx.<init>(SourceFile:38)

– Starting integrated server –
Details:
Level ID: Demo_World
Level Name: Demo_World
Stacktrace:
at bao.a(SourceFile:1610)
at bee.a(SourceFile:217)
at bdw.a(SourceFile:172)
at bee.a(SourceFile:446)
at bdw.k(SourceFile:232)
at bdw.p(SourceFile:211)

– Affected screen –
Details:
Screen name: bee
Stacktrace:
at bao.p(SourceFile:1328)
at bao.ak(SourceFile:774)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_67, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 140780552 bytes (134 MB) / 175984640 bytes (167 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
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: 1.7.10
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2622, Intel
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object 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: []
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)