Windows XP may not have Microsoft Java Virtual Machine (MSJVM). Never
heard that Microsoft lost the court battle with Sun? A clean install of
Windows XP will not include a Java VM. An upgrade install over an
existing qualifying version of Windows that already has the Java VM
installed will upgrade it. According to http://support.microsoft.com/?kbid=813926, SP-1a will not include
support for MSJVM. I don't know if that means it won't upgrade it or if
it actually removes it. Did you do a clean install of Windows XP? Was
it an upgrade (and from what version of Windows)? Did you update to
SP-1 or SP-1a?
At this point, just visit http://java.sun.com/ to download and install
their Java VM.
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