F12 i386 sha1sum check error

[Barry Yu]

I totally downloaded 3 times from different location including 1 by bit torrent but none of them can pass sha1sum check, I downloaded inside XP and use dssha.exe to check the f12 iso file like so: sha1sum Fedora-12-i386-DVD.iso. And copared the result between Fedora-12-i386-CHECKSUM.txt, alway different. Can any one tell me what happened? 
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