Originally Posted by DBTL
I've never seen any system becoming cured by defrag
I have, several times, hence the suggestion.
I would concur with giving the memory an overnight hammering, but the number of people looking for answers to that specific crash address across the net, from a lot of applications also suggests that there may be a weakness in XP that's contributing to this error.
Unfortunately, finding and fixing this may take some time and more detective work before it's finally nailed.