Usually only bothers the neatniks in us, the real performance item you want to try is in this item IF a defragment run actually sped up the machine. Read and use the method noted at http://www.microsoft.com/whdc/device/storage/IDE-DMA.mspx
If the neatnik can't be silenced, they usually get to pay up for the full version of DISKEEPER.
Is there a way to get rid of fragmented files left after running defrag, short of reformatting my hard disk? I have many, many fragmented files showing up, and my computer is running very slow, especially on-line. I'm running an AMD 2 Ghz, with 512 memory.