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Well my issue is that, when i try to play a map in a minecraft version older to that of 1.7.1 snapshot the game just freezes and stays like that for 5 minutes. after that the game closes and the launchers opens with the crash report. Nothing i've done has changed that fact. and previous to this i could easily play anything from 1.7.4 version and below.

Crash Report.

---- Minecraft Crash Report ----
// Shall we play a game?
Time: 4/06/14 06:41 PM
Description: Starting integrated server
java.lang.ExceptionInInitializerError
at net.minecraft.server.MinecraftServer.<init>(SourceFile:113)
at btq.<init>(SourceFile:38)
at azl.a(SourceFile:1585)
at bbt.a(SourceFile:202)
at bbt.a(SourceFile:292)
at bco.l(SourceFile:245)
at bco.k(SourceFile:217)
at azl.p(SourceFile:1303)
at azl.ah(SourceFile:757)
at azl.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:148)
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 nb.<clinit>(SourceFile:31)
... 11 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)
... 15 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)
... 18 more
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect0(Native Method)
at sun.nio.ch.Net.connect(Unknown Source)
at sun.nio.ch.Net.connect(Unknown Source)
at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
at java.nio.channels.SocketChannel.open(Unknown Source)
... 27 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at net.minecraft.server.MinecraftServer.<init>(SourceFile:113)
at btq.<init>(SourceFile:38)
-- Starting integrated server --
Details:
Level ID: lwe2345121
Level Name: lwe2345121
Stacktrace:
at azl.a(SourceFile:1585)
at bbt.a(SourceFile:202)
at bbt.a(SourceFile:292)
at bco.l(SourceFile:245)
at bco.k(SourceFile:217)
-- Affected screen --
Details:
Screen name: bcw
Stacktrace:
at azl.p(SourceFile:1303)
at azl.ah(SourceFile:757)
at azl.f(SourceFile:711)
at net.minecraft.client.main.Main.main(SourceFile:148)
-- System Details --
Details:
Minecraft Version: 1.7.5
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode, sharing), Oracle Corporation
Memory: 44394160 bytes (42 MB) / 79724544 bytes (76 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: 1.7.5
LWJGL: 2.9.1
OpenGL: Intel Bear Lake B GL version 1.4.0 - Build 8.14.10.1930, Intel
GL Caps: Using GL 1.3 multitexturing.
Not using framebuffer objects because OpenGL 1.4 is supported, EXT_blend_func_separate is supported, OpenGL 3.0 is not supported, ARB_framebuffer_object is not supported, and EXT_framebuffer_object is not supported.
Anisotropic filtering is supported and maximum anisotropy is 4.
Shaders are not available because OpenGL 2.1 is not supported, ARB_shader_objects is not supported, ARB_vertex_shader is not supported, and ARB_fragment_shader is not supported.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: []
Current Language: Español (Venezuela)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

I would appreaciate your help, thanks. I really want to play 1.7.4 again