Wikipedia
CCleaner
CCleaner (formerly Crap Cleaner), developed by Piriform, is a utility program used to clean potentially unwanted files (including temporary internet files, where malicious programs and code tend to reside) and invalid Windows Registry entries from a computer.
A public version 1.10 for has been released along with a commercial Network Edition.
CCleaner is mentioned on different software directories, like Softonic, Softpedia, FILEHIPPO, 01Net, where it has been downloaded over 1.5 billion times.
CCleaner has been reviewed by Chip.de, TechRadar, PC Magazine, TechRepublic