OK, my apologies for the attachment. I've used CCleaner fo over 6 years and have always used in in it's "default" state; never had problems. Not once. All updates have never modified those original "default" settings. That's a pretty strong record. I've worked with computers since 1992(DOS), do know command line stuff and am fairly educated in Windows Registry. If in ANY doubt, I check articles online about subjects first!! That's an "absolute". BTW; I'm a retired Marine Engineer, college educated.
I'm not stranger to Windows "Services" section and their settings as well. (I know Win 7 and 8 are largely based on XP's architecture too. Just more "bells and whistles". Stuff I would never use.
If you do not wish attachments, may I inquire as to why you have the attachment link just below?? With the 1.93MB limit??