I have windows xp. When I go to defrag and click analyze, a message pops up and says i should defrag this volumn. After defragging a message says many files could not be defragged. When I click review report it shows that all files that could not be defragged are windows temp files. There are so many fragmented files left that if I click analyze again it still says I should defragment this volumn. In other words, my computer will not satisfactorly defrag files. I have 43% free space left. Any suggestions?