CCleaner is a nice free utility to clean the system and the registry of your computer. It also acts as a privacy tool. It will remove unused / temporary files from your system thereby making the Windows to run faster and freeing up hard disk space. It will also clean the traces of your online activities including your Internet history. Moreover, CCleaner also acts as a useful registry cleaner. Also see: How to make best use of CCleaner to clean your system.
Though CCleaner may not be offering support for a large number of other programs which some similar commercial applications do, it offers support for most of the commonly used programs, including all major browsers, for cleaning their traces and temporary files. Moreover, it is absolutely free and is a simple utility that runs quite fast. It has a simple design / interface which is quite easy to understand and it works smoothly. In fact, I have been using this utility for more than two years now and I am more than satisfied with its excellent performance.
CCleaner will make it easy for you to wipe away the traces of your use from the browsers such as Internet Explorer, Firefox, Google Chrome, Opera and Safari, and also from various Windows system areas. It will also remove traces from some commonly-used third-party applications such as Microsoft Office, Adobe products, WinZip, 7-Zip, WinRAR, Media Player, Google Toolbar, Nero, etc.
For the browsers, CCleaner will remove the cookies, temporary Internet files, history, recently typed URLs, index.dat files, download history, etc. For the system, it will clean the temporary files, empty recycle bin, clipboard, memory dumps, Windows log files, Run history, recent document details, etc.
CCleaner also doubles up as an advanced Registry Cleaner to check for problems and inconsistencies in your registry. It can check problems in registry relating to File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help File references, Application Paths, Icons, Invalid Shortcuts, etc. CCleaner can save a backup of your registry before cleaning it.
It ensures that it cannot delete any useful information or documents that you may still need. It also offers secure file erasing; by overwriting the files before deleting them, making it impossible to recover the data (also see, Permanently delete your files and their contents).
Overall, CCleaner is a very useful must-have utility.