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CCleaner is a program that can be used to clean unwanted and unused files from your computer with relative ease. It deletes the temporary files, cookies, unused data files among others thus freeing up space in your computer and increasing efficiency.
CCleaner also has a registry cleaner function which searches and looks for missing and broken links in your registry and cleans them. By doing these things you can increase the speed of your computer and improve performance. You can download the free CCleaner at http://www.piriform.com/ccleaner.
The free CCleaner has also a portable version. Which means you dont have to install it in your computer to use it. You can just copy the portable version of this software in a thumb drive and directly run it from your thumb drive. You can download the portable version of CCleaner from http://www.piriform.com/ccleaner/download/portable