Thanks for posting back.
Ccleaner does not 'find things wrong' it is purely a cleaner that removes rubbish that accumulates everytime you use you computer, whether browsing or downloading.
If you are happy with Chrome then keep using it. So as not to complicate things or confuse you, stay with Chrome and when you are happy with it, you can give Firefox a try, if you like.
Always have your Windows/Microsoft Updates set to 'Notify me but do not automatically download or install'. That way you can look at what they are for and donload and install a couple at a time and see how they have effected your computer if at all. If everything is fine then get another couple.
That way you can pinpoint which, if any has caused a problem and uninstall it.
dave