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Have an error message and am not able to download game or play. Copied and pasted error message below. Thanks for any help.

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\Bigg\AppData\Roaming\.minecraft\crash-reports\crash-2012-10-13_13.18.46-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

--- BEGIN ERROR REPORT 80ceb478 --------
Generated 10/13/12 1:18 PM
- Minecraft Version: 1.3.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_01, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 470363792 bytes (448 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- LWJGL: 2.4.2
- OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2291, Intel
- Is Modded: Probably not
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
java.lang.RuntimeException: Failed to check session lock, aborting
at aeb.h(SourceFile:49)
at aeb.<init>(SourceFile:35)
at adx.<init>(SourceFile:16)
at ady.a(SourceFile:78)
at net.minecraft.client.Minecraft.a(SourceFile:1288)
at apq.e(SourceFile:142)
at apq.a(SourceFile:116)
at apn.a(SourceFile:64)
at apn.d(SourceFile:112)
at apn.m(SourceFile:100)
at net.minecraft.client.Minecraft.l(SourceFile:1077)
at net.minecraft.client.Minecraft.J(SourceFile:583)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 65d5fb22 ----------