Well my HDD was about 75% occupied before the exercise - say 5Gb free and now I've got 10.9Gb free. Good Job, I'd say. My next little difficulty is that it said it was going to do it every day from now and there appears to be no little box which would give me the option of doing it only manually (because, apart from being unnecessary - very undesirable, even - on a daily basis, it wouldn't even work without being in safe mode, etc.). I have managed to get it down to once a month but will have to do better than that.