У меня крашнулся Minecraft 1.5.что мне делать?

когда я захожу то мне пишет.... Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Failed to start game

A full error report has been saved to C:\Documents and Settings\Admin\Application Data\.minecraft\crash-reports\crash-2013-04-23_07.08.06-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 cb7d3873 --------
Full report at:
C:\Documents and Settings\Admin\Application Data\.minecraft\crash-reports\crash-2013-04-23_07.08.06-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 23.04.13 7:08

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 386313792 bytes (368 MB) / 518979584 bytes (494 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
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: 0, tallocated: 0
LWJGL: 2.4.2
OpenGL: GeForce FX 5200/PCI/SSE/3DNOW! GL version 2.1.2, NVIDIA Corporation
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: SVIDA's Smile Pack 256.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.SecurityException: SHA1 digest error for title/splashes.txt
at sun.security.util.ManifestEntryVerifier.verify(Unknown Source)
at java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.util.jar.JarVerifier.update(Unknown Source)
at java.util.jar.JarVerifier$VerifierStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at java.io.BufferedReader.readLine(Unknown Source)
at bkg.(SourceFile:68)
at net.minecraft.client.Minecraft.a(SourceFile:315)
at avv.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(SourceFile:507)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT ea5efa53 ----------

Что делть?