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I dont know what he is doing or not doing but we got minecraft for his bithday and he can not use it because it crashes after a few minutes. I told him not to load mods or texture pacs because we think they were giving him issues earlier on. Here is the crash report. It should contain all the system info I think.

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.
Time: 6/23/13 8:33 AM
Description: Exception ticking world
java.lang.NullPointerException
at iy.c(SourceFile:201)
at iz.b(SourceFile:122)
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjg.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at iy.c(SourceFile:201)
at iz.b(SourceFile:122)
-- Affected level --
Details:
Level name: Earth
All players: 0 total; []
Chunk stats: ServerChunkCache: 79 Drop: 80
Level seed: -5281374895979304192
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: ~~ERROR~~ NullPointerException: null
Stacktrace:
at net.minecraft.server.MinecraftServer.r(SourceFile:454)
at net.minecraft.server.MinecraftServer.q(SourceFile:397)
at bjg.q(SourceFile:122)
at net.minecraft.server.MinecraftServer.run(SourceFile:331)
at gp.run(SourceFile:573)
-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 160495800 bytes (153 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 6686 (374416 bytes; 0 MB) allocated, 6479 (362824 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
Profiler Position: N/A (disabled)
Vec3 Pool Size: 981 (54936 bytes; 0 MB) allocated, 894 (50064 bytes; 0 MB) used
Player Count: 1 / 8; [jc['Ethaniel1'/268, l='Earth', x=-549.00, y=71.01, z=377.00]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

Thanks, mrre13

This looks like it is happening from a corrupted world so I would suggest Force-Updating and generating a whole new world.

This looks like it may be a known but not yet fixed bug related to the Nether?

https://mojang.atlassian.net/browse/MC-15829
https://mojang.atlassian.net/browse/MC-3583