Chances are AskCV that whats happening is that your machine starts to defrag and then another program writes to the drive and defrag says "oh well, I'd better start again". Close down as many programs as possible before you defrag (anti-virus seems to be the main offender) and start defrag. I'm quite confident that it should help. I had the same problem until I unloaded PC-Cillin. Should work mate.
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