Several suggestions to have defraggler replace itself as the default defragmentation tool:
1) when I open the defrag from drive properties, start defraggler
2) If I have a previous schedule set for M$ defrag...turn it off (based on the GUID of the defrag product)
3) in doing #2, it would also be be benificial to recreate the same schedule with a run of defraggler
Note on 2) when this is set up, it can cause disk overwork. This is especially true when move large files to end of disk is used. M$ defrag will undo the work defraggler did...causing it move them all over again upon re-running. That is a lot of disk movement that is unnecessary...