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。
下载:CCleaner 2.21.940- Added U3 smart drive support. (Separate installer)
- Added support for:
Adobe Reader 9.0, Adobe Photoshop CS3,
Adobe Photoshop CS4, Adobe Illustrator CS4,
Nero Burning ROM 9, OpenOffice 3.1,
AVG AntiVirus 8.0, AntiVir Desktop
and Vuze.
- Added Installed date and size to Uninstall Tool.
- Added support for multiple item selection on Start up tool.
- Added support for cleaning Windows 2008 IIS log files.
- Improved Windows 7 support.
- Improved 64-bit Registry cleaning accuracy.
- Improved loading of System Restore Tool.
- Improved various routines in the uninstaller code.
- Fixed Windows 7 Task Scheduler bug.
- Fixed "No Disk" bug when using Wipe Free Space.
- Fixed Win98 support.
- Minor text and translation improvements.
- Minor bug fixes
