yeah, it never hurts to run that; also a periodic search for .tmp files to delete (the other day I had an end-user's machine just performing sluggishly, I ran the defrag, that didn't improve things...I did a search on temps and there was a temp file that was so big it couldn't be sent to the recycle bin!! WTG
so I deleted it anyway at the prompt and immediately the machine began romping and stomping deft as a champ.