The error message points to a text file containing more info. This is what the file says:

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x690b2c74, pid=4092, tid=3872
#
# JRE version: 6.0_20-b02
# Java VM: Java HotSpot(TM) Client VM (16.3-b01 mixed mode windows-x86 )
# Problematic frame:
# C  [atioglxx.dll+0xb2c74]
#
# If you would like to submit a bug report, please visit:
#   http://java.sun.com/webapps/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

---------------  T H R E A D  ---------------

Current thread (0x3ae32400):  JavaThread "Thread-3" [_thread_in_native, id=3872, stack(0x3b490000,0x3b4e0000)]

siginfo: ExceptionCode=0xc0000005, reading address 0x5ab5002c

Registers:
EAX=0x5ab50028, EBX=0x5ab50028, ECX=0x5ab50028, EDX=0x00000001
ESP=0x3b4df968, EBP=0x3b4df980, ESI=0x435e8000, EDI=0x435e8000
EIP=0x690b2c74, EFLAGS=0x00210206

Top of Stack: (sp=0x3b4df968)
0x3b4df968:   4b8f3008 435e8000 3b4df980 00000000
0x3b4df978:   3b4df96c 5ab50028 0000006f 690b4761
0x3b4df988:   00000071 435e8000 3b4df9f8 00000000
0x3b4df998:   690b4a0e 00001405 4b8f3000 3ae32400
0x3b4df9a8:   3b4df9e8 3b537c47 00000071 00001405
0x3b4df9b8:   4b8f3000 00afaf20 3ae32510 3b4df9e8
0x3b4df9c8:   00000071 00001405 3b4dfa08 00000000
0x3b4df9d8:   5ed028e4 00000000 435e8000 00000001

Instructions: (pc=0x690b2c74)
0x690b2c64:   84 1f 16 00 00 8b 5c 24 14 8d 49 00 8b 44 24 14
0x690b2c74:   8b 68 04 8d 70 0c 03 ee 3b f5 0f 83 f6 15 00 00

Stack: [0x3b490000,0x3b4e0000],  sp=0x3b4df968,  free space=13e3b4df49ck
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C  [atioglxx.dll+0xb2c74]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
J  org.lwjgl.opengl.GL11.nglCallLists(IILjava/nio/Buffer;IJ)V
J  org.lwjgl.opengl.GL11.glCallLists(Ljava/nio/IntBuffer;)V
J  com.mojang.minecraft.b.g.a(Lcom/mojang/minecraft/player/Player;I)I
j  com.mojang.minecraft.l.run()V+3680
j  java.lang.Thread.run()V+11
v  ~StubRoutines::call_stub

---------------  P R O C E S S  ---------------

Java Threads: ( => current thread )
  0x3ae61400 JavaThread "Thread-9" daemon [_thread_blocked, id=4012, stack(0x4d8e0000,0x4d930000)]
  0x4b934800 JavaThread "Java Sound Event Dispatcher" daemon [_thread_blocked, id=1528, stack(0x4d6f0000,0x4d740000)]
  0x002b6c00 JavaThread "DestroyJavaVM" [_thread_blocked, id=1940, stack(0x008c0000,0x00910000)]
  0x3ae48400 JavaThread "Timer-0" [_thread_blocked, id=3788, stack(0x3b4e0000,0x3b530000)]
=>0x3ae32400 JavaThread "Thread-3" [_thread_in_native, id=3872, stack(0x3b490000,0x3b4e0000)]
  0x3ae70800 JavaThread "Thread-2" daemon [_thread_blocked, id=1976, stack(0x3b440000,0x3b490000)]
  0x3af34800 JavaThread "TimerQueue" daemon [_thread_blocked, id=948, stack(0x3b270000,0x3b2c0000)]
  0x3aeb8c00 JavaThread "AWT-EventQueue-0" [_thread_blocked, id=3000, stack(0x3b1e0000,0x3b230000)]
  0x3aeaf000 JavaThread "AWT-Windows" daemon [_thread_in_native, id=3360, stack(0x3b140000,0x3b190000)]
  0x3aeae400 JavaThread "AWT-Shutdown" [_thread_blocked, id=3960, stack(0x3b0f0000,0x3b140000)]
  0x3aeaa000 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=1876, stack(0x3b0a0000,0x3b0f0000)]
  0x3ab20000 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=3896, stack(0x3ad70000,0x3adc0000)]
  0x3ab19800 JavaThread "CompilerThread0" daemon [_thread_blocked, id=3840, stack(0x3ad20000,0x3ad70000)]
  0x3ab18000 JavaThread "Attach Listener" daemon [_thread_blocked, id=2460, stack(0x3acd0000,0x3ad20000)]
  0x3ab16c00 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=2888, stack(0x3ac80000,0x3acd0000)]
  0x3ab07800 JavaThread "Finalizer" daemon [_thread_blocked, id=2132, stack(0x3ac30000,0x3ac80000)]
  0x3ab02c00 JavaThread "Reference Handler" daemon [_thread_blocked, id=696, stack(0x3abe0000,0x3ac30000)]

Other Threads:
  0x3ab00000 VMThread [stack: 0x3ab90000,0x3abe0000] [id=452]
  0x3ab22000 WatcherThread [stack: 0x3adc0000,0x3ae10000] [id=1484]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap
 def new generation   total 23360K, used 8781K [0x02990000, 0x042e0000, 0x13430000)
  eden space 20800K,  41% used [0x02990000, 0x03216790, 0x03de0000)
  from space 2560K,   2% used [0x03de0000, 0x03decd10, 0x04060000)
  to   space 2560K,   0% used [0x04060000, 0x04060000, 0x042e0000)
 tenured generation   total 51784K, used 30720K [0x13430000, 0x166c2000, 0x34990000)
   the space 51784K,  59% used [0x13430000, 0x15230298, 0x15230400, 0x166c2000)
 compacting perm gen  total 12544K, used 12383K [0x34990000, 0x355d0000, 0x38990000)
   the space 12544K,  98% used [0x34990000, 0x355a7da8, 0x355a7e00, 0x355d0000)
No shared spaces configured.

Dynamic libraries:
0x00400000 - 0x00424000     C:\Program Files\Java\jre6\bin\java.exe
0x7c900000 - 0x7c9b2000     C:\WINDOWS\system32\ntdll.dll
0x7c800000 - 0x7c8f6000     C:\WINDOWS\system32\kernel32.dll
0x77dd0000 - 0x77e6b000     C:\WINDOWS\system32\ADVAPI32.dll
0x77e70000 - 0x77f02000     C:\WINDOWS\system32\RPCRT4.dll
0x77fe0000 - 0x77ff1000     C:\WINDOWS\system32\Secur32.dll
0x7c340000 - 0x7c396000     C:\Program Files\Java\jre6\bin\msvcr71.dll
0x6d800000 - 0x6da97000     C:\Program Files\Java\jre6\bin\client\jvm.dll
0x7e410000 - 0x7e4a1000     C:\WINDOWS\system32\USER32.dll
0x77f10000 - 0x77f59000     C:\WINDOWS\system32\GDI32.dll
0x76b40000 - 0x76b6d000     C:\WINDOWS\system32\WINMM.dll
0x76390000 - 0x763ad000     C:\WINDOWS\system32\IMM32.DLL
0x5cd70000 - 0x5cd77000     C:\WINDOWS\system32\serwvdrv.dll
0x5b0a0000 - 0x5b0a7000     C:\WINDOWS\system32\umdmxfrm.dll
0x6d7b0000 - 0x6d7bc000     C:\Program Files\Java\jre6\bin\verify.dll
0x6d330000 - 0x6d34f000     C:\Program Files\Java\jre6\bin\java.dll
0x6d290000 - 0x6d298000     C:\Program Files\Java\jre6\bin\hpi.dll
0x76bf0000 - 0x76bfb000     C:\WINDOWS\system32\PSAPI.DLL
0x6d7f0000 - 0x6d7ff000     C:\Program Files\Java\jre6\bin\zip.dll
0x6d000000 - 0x6d14a000     C:\Program Files\Java\jre6\bin\awt.dll
0x73000000 - 0x73026000     C:\WINDOWS\system32\WINSPOOL.DRV
0x77c10000 - 0x77c68000     C:\WINDOWS\system32\msvcrt.dll
0x774e0000 - 0x7761d000     C:\WINDOWS\system32\ole32.dll
0x773d0000 - 0x774d3000     C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.5512_x-ww_35d4ce83\COMCTL32.dll
0x77f60000 - 0x77fd6000     C:\WINDOWS\system32\SHLWAPI.dll
0x5ad70000 - 0x5ada8000     C:\WINDOWS\system32\uxtheme.dll
0x6d230000 - 0x6d284000     C:\Program Files\Java\jre6\bin\fontmanager.dll
0x634b0000 - 0x634cd000     C:\Documents and Settings\All Users\Application Data\Real\RealPlayer\BrowserRecordPlugin\Chrome\Hook\rpchromebrowserrecordhelper.dll
0x7c9c0000 - 0x7d1d7000     C:\WINDOWS\system32\SHELL32.dll
0x4ec50000 - 0x4edfb000     C:\WINDOWS\WinSxS\x86_Microsoft.Windows.GdiPlus_6595b64144ccf1df_1.0.6001.22319_x-ww_f0b4c2df\gdiplus.dll
0x7c3a0000 - 0x7c41b000     C:\WINDOWS\system32\MSVCP71.dll
0x74720000 - 0x7476c000     C:\WINDOWS\system32\MSCTF.dll
0x755c0000 - 0x755ee000     C:\WINDOWS\system32\msctfime.ime
0x6d610000 - 0x6d623000     C:\Program Files\Java\jre6\bin\net.dll
0x71ab0000 - 0x71ac7000     C:\WINDOWS\system32\WS2_32.dll
0x71aa0000 - 0x71aa8000     C:\WINDOWS\system32\WS2HELP.dll
0x6d630000 - 0x6d639000     C:\Program Files\Java\jre6\bin\nio.dll
0x71a50000 - 0x71a8f000     C:\WINDOWS\System32\mswsock.dll
0x76f20000 - 0x76f47000     C:\WINDOWS\system32\DNSAPI.dll
0x76fb0000 - 0x76fb8000     C:\WINDOWS\System32\winrnr.dll
0x76f60000 - 0x76f8c000     C:\WINDOWS\system32\WLDAP32.dll
0x64000000 - 0x64025000     C:\Program Files\Bonjour\mdnsNSP.dll
0x76d60000 - 0x76d79000     C:\WINDOWS\system32\Iphlpapi.dll
0x76fc0000 - 0x76fc6000     C:\WINDOWS\system32\rasadhlp.dll
0x662b0000 - 0x66308000     C:\WINDOWS\system32\hnetcfg.dll
0x71a90000 - 0x71a98000     C:\WINDOWS\System32\wshtcpip.dll
0x77120000 - 0x771ab000     C:\WINDOWS\system32\OLEAUT32.DLL
0x3b530000 - 0x3b587000     C:\Documents and Settings\User\Desktop\womclient-1.5.9\native\windows\lwjgl.dll
0x5ed00000 - 0x5edcc000     C:\WINDOWS\system32\OPENGL32.dll
0x68b20000 - 0x68b40000     C:\WINDOWS\system32\GLU32.dll
0x73760000 - 0x737ab000     C:\WINDOWS\system32\DDRAW.dll
0x73bc0000 - 0x73bc6000     C:\WINDOWS\system32\DCIMAN32.dll
0x77c00000 - 0x77c08000     C:\WINDOWS\system32\VERSION.dll
0x6d360000 - 0x6d366000     C:\Program Files\Java\jre6\bin\jawt.dll
0x69000000 - 0x6948f000     C:\WINDOWS\system32\atioglxx.dll
0x4bcb0000 - 0x4bcc6000     C:\Documents and Settings\User\Desktop\womclient-1.5.9\native\windows\jinput-dx8.dll
0x6ce10000 - 0x6ce48000     C:\WINDOWS\system32\DINPUT8.dll
0x688f0000 - 0x688f9000     C:\WINDOWS\system32\HID.DLL
0x77920000 - 0x77a13000     C:\WINDOWS\system32\SETUPAPI.DLL
0x76c30000 - 0x76c5e000     C:\WINDOWS\system32\WINTRUST.dll
0x77a80000 - 0x77b15000     C:\WINDOWS\system32\CRYPT32.dll
0x77b20000 - 0x77b32000     C:\WINDOWS\system32\MSASN1.dll
0x76c90000 - 0x76cb8000     C:\WINDOWS\system32\IMAGEHLP.dll
0x68000000 - 0x68036000     C:\WINDOWS\system32\rsaenh.dll
0x769c0000 - 0x76a74000     C:\WINDOWS\system32\USERENV.dll
0x5b860000 - 0x5b8b5000     C:\WINDOWS\system32\netapi32.dll
0x6d520000 - 0x6d544000     C:\Program Files\Java\jre6\bin\jsound.dll
0x6d550000 - 0x6d558000     C:\Program Files\Java\jre6\bin\jsoundds.dll
0x73f10000 - 0x73f6c000     C:\WINDOWS\system32\DSOUND.dll
0x72d20000 - 0x72d29000     C:\WINDOWS\system32\wdmaud.drv
0x72d10000 - 0x72d18000     C:\WINDOWS\system32\msacm32.drv
0x77be0000 - 0x77bf5000     C:\WINDOWS\system32\MSACM32.dll
0x77bd0000 - 0x77bd7000     C:\WINDOWS\system32\midimap.dll
0x73ee0000 - 0x73ee4000     C:\WINDOWS\system32\KsUser.dll

VM Arguments:
jvm_args: -Djava.library.path=native\windows -Dsun.java2d.noddraw=true -Dsun.awt.noerasebackground=true -Dsun.java2d.d3d=false -Dsun.java2d.opengl=false -Dsun.java2d.pmoffscreen=false -Xmx800M
java_command: Main
Launcher Type: SUN_STANDARD

Environment Variables:
CLASSPATH=.;C:\Program Files\Java\jre6\lib\ext\QTJava.zip
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\ATI Technologies\ATI Control Panel;C:\Program Files\QuickTime\QTSystem\;C:\WINDOWS\system32\WindowsPowerShell\v1.0;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL Server\100\DTS\Binn\;C:\Program Files\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\
USERNAME=User
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 2 Stepping 9, GenuineIntel

---------------  S Y S T E M  ---------------

OS: Windows XP Build 2600 Service Pack 3

CPU:total 1 (1 cores per cpu, 1 threads per core) family 15 model 2 stepping 9, cmov, cx8, fxsr, mmx, sse, sse2

Memory: 4k page, physical 785392k(245792k free), swap 1922748k(1187332k free)

vm_info: Java HotSpot(TM) Client VM (16.3-b01) for windows-x86 JRE (1.6.0_20-b02), built on Apr 12 2010 13:52:23 by "java_re" with MS VC++ 7.1 (VS2003)

time: Sun May 02 10:52:52 2010
elapsed time: 3396 seconds

---------------

It says My OS is Windows NT, but I'm on an XP.