Minecraft has crashed! I dont get why...but it wont let me back on to play with my friends...I have a premium account...but it just keeps saying it has crashed and I cant get minecraft up.

Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Updating screen events

A full error report has been saved to C:\Users\Chase\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-27_13.27.30-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash

— BEGIN ERROR REPORT ce8071a9 --------
Full report at:
C:\Users\Chase\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-27_13.27.30-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 1/27/13 1:27 PM

– Head –
Stacktrace:
at paulscode.sound.SoundSystem.newSource(SourceFile:717)
at bev.a(SourceFile:273)
at aul.a(SourceFile:71)
at bey.a(SourceFile:414)
at aul.d(SourceFile:127)
at aul.m(SourceFile:111)

– Affected screen –
Details:
Screen name: bey
Stacktrace:
at net.minecraft.client.Minecraft.l(SourceFile:1086)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 1.4.7
Operating System: Windows Vista (x86) version 6.1
Java Version: 1.6.0_07, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 11391072 bytes (10 MB) / 99942400 bytes (95 MB) up to 99942400 bytes (95 MB)
JVM Flags: 6 total; -Xbootclasspath/a:C:\PROGRA~2\Java\JRE16~1.0_0\lib\deploy.jar;C:\PROGRA~2\Java\JRE16~1.0_0\lib\plugin.jar -Xmx96m -Xverify:remote -Xbootclasspath/a:C:\PROGRA~2\Java\JRE16~1.0_0\lib\deploy.jar;C:\PROGRA~2\Java\JRE16~1.0_0\lib\plugin.jar -Xmx96m -Xverify:remote
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
LWJGL: 2.4.2
OpenGL: Intel Bear Lake B GL version 1.4.0 - Build 8.14.10.1930, Intel
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~_ERROR~ NullPointerException: null

java.lang.NullPointerException
at paulscode.sound.SoundSystem.newSource(SourceFile:717)
at bev.a(SourceFile:273)
at aul.a(SourceFile:71)
at bey.a(SourceFile:414)
at aul.d(SourceFile:127)
at aul.m(SourceFile:111)
at net.minecraft.client.Minecraft.l(SourceFile:1086)
at net.minecraft.client.Minecraft.J(SourceFile:582)
at net.minecraft.client.Minecraft.run(SourceFile:534)
at java.lang.Thread.run(Unknown Source)
— END ERROR REPORT 30a155b3 ----------