Hi there, i have the same problem defraggler hungs up in a "loop" one time the loop starts at 71%, then i stopped defragmentation. Sart again, it hungs up on 63%. Windows Vista 2,1 Ghz dual core I am very sad, want to use defraggler, because for me it did in the past a realy good job. Until yesterday i used the newest version of defraggler. For me it seems like some Problems with restore points like some users wrote allready, because a couple of days ago i had trouble with my videocard i reinstalled it on my notebook and in the loop it always shows the same after a while. C.../ATI... I hope you can fix the bug!