David,
 DS> Does anyone know the error message of GP0000 AT Pdoxwin:B4:00C4 mean?
Yeah!  Nothing much, other than there was a general protection fault at
that address.  This is Windows' rather unhelpful way of saying that something 
odd happened.  Which isn't too helpful.  What were/are you doing when the 
error appeared/s?  That might be more indicative than the memory address 
where the error was encountered.
 
-- Lance
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