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Could you tell us what antivirus you are running on your XP install?
There is a known issue with norton Internet security not handling files correctly which can cause a BSOD on parallels and Bootcamp installs.
So could you try uninstalling Norton and seeing if it behaves itself for the next 24hrs or so.
Just let me know tomorrow or whenever how you get on, If that works then you may wish to try the free version of AVG antivirus instead of Norton http://www.grisoft.com/ww.download-trial