IMPORTANT: If You're A CCleaner User You Need To Read This. [1]

If you use the free CCleaner tool from Piriform, which removes junk from your PC and registry, then you need to upgrade your software as soon as possible.

It's been reported that the installer file for CCleaner had been compromised back in August, by person or persons unknown. It had been altered to send details of the user's computer to a server in the USA. Piriform kept quiet about the discovery until police in the US had located and shut down that server. Now that they have done so, Piriform have released a new version of CCleaner and are urging everyone to upgrade.

If you use CCleaner or CCleaner cloud, you need to download and install the latest version. If you're not already a user of the software, and you want to try it, then you should also ensure that you download the very latest release.

You'll find the latest free version of CCleaner at https://www.piriform.com/ccleaner [3] and it's a 10 MB file. Web of Trust rates the site as reputable, and VirusTotal merely notes that it includes the Google Toolbar as an optional extra. So the file is safe to download and use. Meanwhile, if you already have CCleaner installed, you should either update or remove it. In theory, the compromised version won't do any damage now that the US server has been shut down, but it's best to stay on the safe side.