Financial Times
"There is no shortage of good, free hard drive file cleaners but my favourite is Piriform's CCleaner, which quickly and reliably removes unused and temporary files, cookies, browsing histories, files in the recycle bin and other digital detritus that can clog up a system or compromise your anonymity. As a bonus, it also checks the Windows registry for invalid entries."

Read the full review at:
http://www.ft.com/cms/s/0/ca4e1c1a-e8a7-11dd-a4d0-0000779fd2ac.html?nclick_check=1