Follow up to Nov 20 posting -
Recently had accumulated several restore points in system. Ran regular Defraggler; it was 49% at 20 minutes; it took another 20 minutes to get to 51%, so I canceled it.
Deleted all but most recent restore point, as that solved problem last time - not so this time. Quick Defraggler ran in 15 seconds. Also ran Vista supplied defragger which completed in 30 min.
Ran full Defraggler - it was 50% in 1 minute and 81% in 4 minutes. It stalled at 81%. It shows files being read and written, but no change in percent done. Canceled at 32 minutes. If Defraggler won't complete in less time than the Vista supplied defragger, why run it??