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Finding this in the error log

# C [OpenAL64.dll+0x6220] alSourcei+0x144

Fix

Update the LightWeight Java Game Library

As mentioned here:

http://www.minecraftwiki.net/wiki/Tutorials/Update_LWJGL

And

http://www.minecraftforum.net/topic/1356245-random-crashing/

Port forward 25565

Allow said ports access on Windows 7 firewall and also allow JAVA.exe access.