CCleaner 是一款免费的系统优化和隐私保护工具。CCleaner 的主要用来清除Windows系统不再使用的垃圾文件，以腾出更多硬盘空间。它的另一大功能是清除使用者的上网记录。CCleaner 的体积小，运行速度极快，可以对临时文件夹、历史记录、回收站等进行垃圾清理，并可对注册表进行垃圾项扫描、清理。附带软件卸载功能。 同时支持IE、Firefox还有Oprea等。

CCleaner (formerly Crap Cleaner) is a freeware system optimization and privacy tool. It removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it's fast! (normally taking less than a second to run) and Free.

Cleans the following:

• Internet Explorer Cache, History, Cookies, Index.dat.
• Recycle Bin, Temporary files and Log files.
• Recently opened URLs and files.
• Third-party application temp files and recent file lists (MRUs).
  Including: Firefox, Opera, Media Player, eMule, Kazaa, Google Toolbar, Netscape, Office XP, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and more...
• Advanced Registry scanner and cleaner to remove unused and old entries.
  Including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more... Backup for registry clean.
• Windows Startup tool.

v2.25.1025
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- Improved Windows 7 jump list cleaning.
- Improved Windows 7 thumbnail cache cleaning.
- Added support for Windows Server 2008 R2.
- Improved 64-bit support and performance.
- Fixed issue with Windows 7 task scheduler.
- Fixed issue with Startup tool, displaying incorrect folder contents.
- Added support for AVG Antivirus 9.0.
- Added support for ExcludeKey in INI files.
- Improved support for wildcards and RECURSE/REMOVESELF.
- Fixed minor GUI bugs in non-English versions.
- Fixed minor GUI usability issues.
- Improved input validation.
- Lots of minor bugs fixed.

v2.23.999
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- Improved Opera 10 support for final release.
- Fixed the "No Disk" exception error.
- Fixed %ProgramFiles% bug in 64-bit Registry scanning.

v2.23.993
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- Added Taskbar Jump List cleaning for Windows 7.
- Added history cleaning support for Opera 10.
- Added icons to Cookie selection to show browser.
- Improved scrolling in new results window.
- Improved Avira Anti-virus cleaning.
- Improved multiselect in listviews.
- Improved 64-bit support when including/excluding files.
- Improved 64-bit issue detection in Registry screen.
- Updated internal icons.
- Added language support for Armenian.
- Fixed language bugs with new results window.
- Fixed bug in Recycle Bin cleaning.
- Fixed minor bug with help files in Registry Cleaner.
- Fixed bug when deleting an application in Uninstall Tool.
- Fixed bug when enabling/disabling in Startup Tool.
- Minor GUI improvements.

免费使用，支持包括简体中文在内的31国语言界面！

View complete version history

官方多国语言安装版：http://download.piriform.com/ccsetup225.exe
官方多语言绿色便携版：http://www.ccleaner.com/download/builds/downloading-portable

20090915更新~
20091027更新~