Eclipse crashing and disappearing (Windows XP)

I have two instances of Eclipse.

Old instance

Few months of use. Upgraded from Helios to Juno. JRE 1.6. Recently started crashing with Java error code -1. So I decided to start fresh:

New instance

Fresh download of Juno. JRE 1.7. From the very beginning, would randomly disappear all of a sudden. No crash messages, no log entry, no process resident. Just working, working, working, poof! GONE! Doesn't even auto-save on crash.

Computer Specs

• Windows XP SP3 with latest updates
• Pentium 4
• HP Compaq Desktop

What are the probable causes? Any idea to fix this?

UPDATE:

Managed to find the error log. Highlights are as follows:

# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6e832906, pid=3648, tid=1632
#
# JRE version: 7.0_13-b20
# Java VM: Java HotSpot(TM) Client VM (23.7-b01 mixed mode windows-x86 )
# Problematic frame:
# V  [jvm.dll+0x72906]

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

Current thread (0x02e6ac00):  VMThread [stack: 0x03160000,0x03260000] [id=1632]

Register to memory mapping:

EAX=0x00000042 is an unknown value
EBX=0x0325fb7c is an unknown value
ECX=0x30924980 is an oop
{constMethod} 
 - klass: {other class}
 - method:       0x309249a0 {method} 'equals' '(Ljava/lang/Object;)Z' in 'org/eclipse/swt/graphics/RGB'
 - exceptions:   0x30011128
EDX=0x3ffffffe is an unallocated location in the heap
ESP=0x0325fb2c is an unknown value
EBP=0x0325fb54 is an unknown value
ESI=
[error occurred during error reporting (printing register info), id 0xc0000005]

Stack: [0x03160000,0x03260000],  sp=0x0325fb2c,  free space=1022k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [jvm.dll+0x72906]
    ...
C  [MSVCR100.dll+0x5c6de]  endthreadex+0x3a
C  [MSVCR100.dll+0x5c788]  endthreadex+0xe4
C  [kernel32.dll+0xb729]  GetModuleFileNameA+0x1ba

VM_Operation (0x0d65f854): GenCollectFull, mode: safepoint, requested by thread 0x41e5b400