I use it often and have not had any problems with CCleaner.
However,,, The Registry Cleaner, I always warn against any and all so called reg cleaners.
They can be useful if used properly,, but many times, people just willy nilly click fix all and expect everything to be hunky dory. ( i have never actually type those words,, wow,, I feel like a goober.. yeah that one too )
Well,, stop using Registry Cleaners, even the one available in CCleaners.