I am not too sure about this type of utility
I have heard much controversy on the subject of certain programs touted to clean out unwanted items on the hard drive of our computers. Some have said that the registry cleaners can remove files that are necessary for windows to run, I suppose you better just be real careful about the one you choose and make sure you know enough about them and that you can use a restore program if it is needed. I am going to get some advise from my computer geek of a nephew and see what he has to say about it all. Since he is the one who comes to my rescue when I do dumb stuff.