CCleaner Free [Download] Be safer online: Advertisers and Web sites track your behavior online with cookies that stay on your computer. CCleaner erases these cookies so any browsing you do stays confidential. Reduce crashes: The Registry stores Windows settings. Over time, it can become cluttered and filled with errors, and can lead to crashes. CCleaner clears out the clutter so your PC is more stable. Speed up your startup: Many programs run silently in the background when you start your PC. CCleaner helps you get to work  or play  faster by letting you disable unneeded programs. Easy to use: If you can use email, you can use CCleaner. Its point-and-click, and you decide what to clean and what to keep.