I've not come across that error, so take this with grains o' salt - but a general swiss army knife sort of tactic for miscellaneous Windows problems is to make sure you kill of temp files. In this case, there might be one that is linked to a corrupt backup or similar.
I could explain how to do this in XP, but my explanation may not be the clearest - maybe best to Google 'delete .tmp files in XP' and get yourself an MS Technet post to work from - or if you already know how to clear out temp files (not temp. internet files), then give that a try ...
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