Ccleaner is a great tool to have on your system anyway, good for cleaning up your disc’s from your browsing history, cookies, temp files and just about everything that could or should be cleaned, it also does light registry cleaning.
Most people here use it and it is very safe, its never taken out anything that it shouldn’t like many other cleaner’s can, far better than the windows disc cleaner.
What is windows safety ? if you mean the microsoft saftey scanner iv never used it.