For all users satisfaction. I have just run Ccleanerj quite a few of its extra functions selected, and its Regcleaner. after that I ran the built in Clean disk. No ill effects - so far. Use at your peril! By the way. Afterwards I ran the defrag. No blogs or mention of this, but they have done something useful! It goes through the procedure at about 4 times the speed of any prvious!!!!