I've heard about Defraggler today and thought I'd just give it a try. They use CCleaner in our company and I also installed it today.
Defraggler does a disk analysis and then shows me the basic summary it has found. But whatever I do next, it doesn't take long and the whole application is in a life lock, taking 50% CPU time (single thread of dual core) and not responding to input anymore.
I've tried to view the list of files, making the columns a bit wider, sorting by different column; next time I have searched files by path to see where they reside on my disk.
I have no idea where this bug comes from as I've done nothing special, just looking around for a moment.
I won't let an application that freezes all the time touch any of my files. Could you please fix that?