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trying to help my son with his minecraft issue---keeps crashing when he ogs in

following error message received

any help would be greatly appreciated!!!

BEGIN ERROR REPORT 5bd66923 --------
Generated 10/28/12 7:34 PM

- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.6.0_26, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
- Memory: 478535664 bytes (456 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- LWJGL: 2.4.2
- OpenGL: GeForce GT 540M/PCI/SSE2 GL version 4.1.0, NVIDIA Corporation
- Is Modded: Probably not
- Type: Client
- Texture Pack: SphaxPureBDCraftTexturePack16xMC13.zip
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null

java.lang.SecurityException: SHA1 digest error for fu.class
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 sun.misc.Resource.getBytes(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.server.MinecraftServer.al(SourceFile:117)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:104)
at bcb.<init>(SourceFile:32)
at net.minecraft.client.Minecraft.a(SourceFile:1325)
at asz.e(SourceFile:153)
at asz.a(SourceFile:120)
at asw.a(SourceFile:64)
at asw.d(SourceFile:112)
at asw.m(SourceFile:100)
at net.minecraft.client.Minecraft.l(SourceFile:1077)
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 98aa23a6 ----------

updated to latest Java
still crashes

this is error

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\Eugene\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-01_20.00.48-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

--- BEGIN ERROR REPORT 94cb0cc1 --------
Generated 11/1/12 8:00 PM
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_09, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 474836424 bytes (452 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- LWJGL: 2.4.2
- OpenGL: GeForce GT 540M/PCI/SSE2 GL version 4.1.0, NVIDIA Corporation
- Is Modded: Probably not
- Type: Client
- Texture Pack: SphaxPureBDCraftTexturePack16xMC13.zip
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null
java.lang.SecurityException: SHA1 digest error for fu.class
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 sun.misc.Resource.getBytes(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.server.MinecraftServer.al(SourceFile:117)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:104)
at bcb.<init>(SourceFile:32)
at net.minecraft.client.Minecraft.a(SourceFile:1325)
at asz.e(SourceFile:153)
at asz.a(SourceFile:120)
at asw.a(SourceFile:64)
at asw.d(SourceFile:112)
at asw.m(SourceFile:100)
at net.minecraft.client.Minecraft.l(SourceFile:1077)
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 38033da9 ----------

updated Java as well as NVIDIA video driver and still crashes

new error report is

Minecraft has crashed!
----------------------
Minecraft has stopped running because it encountered a problem; Unexpected error
This error has been saved to C:\Users\Eugene\AppData\Roaming\.minecraft\crash-reports\crash-2012-11-01_20.18.44-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.

--- BEGIN ERROR REPORT 347483b6 --------
Generated 11/1/12 8:18 PM
- Minecraft Version: 1.4.2
- Operating System: Windows 7 (amd64) version 6.1
- Java Version: 1.7.0_09, Oracle Corporation
- Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
- Memory: 476295840 bytes (454 MB) / 514523136 bytes (490 MB) up to 954466304 bytes (910 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- LWJGL: 2.4.2
- OpenGL: GeForce GT 540M/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
- Is Modded: Probably not
- Type: Client
- Texture Pack: SphaxPureBDCraftTexturePack16xMC13.zip
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null
java.lang.SecurityException: SHA1 digest error for fu.class
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 sun.misc.Resource.getBytes(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at net.minecraft.server.MinecraftServer.al(SourceFile:117)
at net.minecraft.server.MinecraftServer.<init>(SourceFile:104)
at bcb.<init>(SourceFile:32)
at net.minecraft.client.Minecraft.a(SourceFile:1325)
at asz.e(SourceFile:153)
at asz.a(SourceFile:120)
at asw.a(SourceFile:64)
at asw.d(SourceFile:112)
at asw.m(SourceFile:100)
at net.minecraft.client.Minecraft.l(SourceFile:1077)
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 55278a4e ----------

Thanks- that fixed it! All is working great now

Much appreciated!!!!