CCleaner is a tool to clean your system from temporary and unnecessary files that accumulate over time. This also includes rather thorough cleaning of Internet and PC usage tracks like browser cache, recently used files, web sites visited and more. You can select the items that you want cleaned, and also specify cookies that should not be deleted. In addition, the program comes with a registry scanner that scans for invalid references (advanced users) and options to start cleaning automatically or from the command line.