Egin, I had the exact same problem and if you go into management console you will see that the module for XP defrag is missing, for some reason diskeeper installs parts of itself on top of XP defrag and when you remove it it also removes XP defrag,
Till this day I have tried to fix it with out a complete install/repair job but no luck so I reinstalled Diskeeper light (free version) again, have tried various other programs in the meantime. but no like any of the others .... oh and you will find that after installing Diskeepr again XP defrag works fine <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
