See link which supports my findings and/or my current opinion about ccleaner by Piriform (now owned by Avast).
Sadly I no longer can trust ccleaner after the reported 'inside job' (which seems questionable as to if Piriform was either hacked and/or the company itself had/has someone untrustworthy working there, and/or that Avast itself may be either involved and/or possibly even responsible for the 'irreparable' machine damage that was reportedly handed to Users.
And since I can't exclude Avast AV from my suspicions that it seems likely as not that Avast stands/stood to profit from the infected Users , e.g.; once realizing their machine's unacceptable behavior apparently would likely invoke Users into purchasing Avast (as opposed to continuing to run Avast's free AV, assuming that Avast Premium was/is immune to 'ccleaner's malware).
So no matter where ccleaner's malware stemmed from, so far as I know, neither company has put up the effort or expertise to resolve the millions of infected machines by offering either a fix or even compensation Users for the time, money and aggravation of wiping once useful and clean machines and painstakingly "clean installing" the OS platform(s), not to mention, all the programs and app's ('simply' to rid our machines of the malware), it's otherwise a sad, sad day that Users (like myself) are finding this out, and not by any (known to me) notices of the 'hacking' and/or the need to wipe and completely re-install, but by sheer luck at running across that article.
Good site but you need to be careful about some of the functions its programs provide since 'cleaning' your registry is not recommended. Nevertheless, emptying some of the junk that accumulates CAN be very useful as viruses tend to hide behind temp folders difficult to find and Windows' own cleanup service is minimal. It's a good program if you know what you're doing. It's not spyware or anything but caution is required - also the services it provides can potentially be harmful to your machine.
Useful software, but always pushing for people to buy the paid version by making users jump through hoops to get the free version.
Recuva should really consider adding a warning to the installer not to install on a hard drive that has deleted data though; doing so can destroy missing data.