Wait!!
In the chest under last time of modifacation the time givien hasn't even happened on my computer clock!
Same thing happened to me. While accessing a web site, Avast popped up a warning "9/18/09 8:00:11 AM j 4294946495 Sign of "JS:Pdfka-PO [Trj]" has been found in "C:\WINDOWS\TEMPORARY INTERNET FILES\CONTENT.IE5\QVQZA5IB\66[1].PDF" file." I moved the file to the chest 9-18-09 8:00:52AM and it logged it as "Last changed 9-18-09 12:00:10PM". My computer clock now reads 9:36AM on 9-18-09 which is the correct time here which is USA eastern daylight time zone, so something wrong with the chest time, I guess.