How big are the messages if they are between +/- 143 kb and +/- 313 kb it could be the kleze especially if there are files in the c:\ that have dubble extentions like *.pdf.xls. And if there is a file in the windows\system called Wink* something it's a virus...And maybe it's some person that has the email address wrong...

Good luck!
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XaMi©