Hello gringopig, thank you very much for posting this issue overhere. Thanks to this post I found the reason of the constant rebuilding of my search index.
I am one of these so called advanced PC users, the ones that help friends and family out when they have pc-trouble. In the past years I have been using Ccleaner with default settings and without any negative consequences. That´s why I recommend it to less computer literate people as well. I completely agree with you that Ccleaner developers should turn the MS Search options OFF by default, as it creates unwanted effects for the average user.
@Alan_B and Winapp2: you are the typical computer geeks that are not able to understand that 95% of the world is not like you. Ccleaner profiles itself as a cleanup tool for the millions, it is not a geek tool. Its strength has always been to be a reliable cleanup tool that can be used with default settings without harming your system. With the MS Search option, Ccleaner causes trouble with standard functionality in Windows, this should be fixed!
And how ridiculous is it to say "Windows Search is useless anyway" and even suggest another indexing tool.... pfff
Imagine you go to a carwash, they wash your car and afterwards your radio-antenna is broken. You would say: Radio is useless anyway, CD´s give you better soundquality, I suggest you listen only CD´s in the future....